diff --git a/core/src/main/kotlin/net/corda/core/flows/LedgerRecoverFlow.kt b/core/src/main/kotlin/net/corda/core/flows/LedgerRecoverFlow.kt
index 41a869e2ff..b8cd728224 100644
--- a/core/src/main/kotlin/net/corda/core/flows/LedgerRecoverFlow.kt
+++ b/core/src/main/kotlin/net/corda/core/flows/LedgerRecoverFlow.kt
@@ -14,36 +14,17 @@ import net.corda.core.utilities.ProgressTracker
 @StartableByRPC
 @InitiatingFlow
 class LedgerRecoveryFlow(
-        private val recoveryPeers: Collection<Party>,
-        private val timeWindow: RecoveryTimeWindow? = null,
-        private val useAllNetworkNodes: Boolean = false,
-        private val transactionRole: TransactionRole = TransactionRole.ALL,
-        private val dryRun: Boolean = false,
-        private val optimisticInitiatorRecovery: Boolean = false,
-        override val progressTracker: ProgressTracker = ProgressTracker()) : FlowLogic<Map<SecureHash, RecoveryResult>>() {
+        private val parameters: LedgerRecoveryParameters,
+        override val progressTracker: ProgressTracker = ProgressTracker()) : FlowLogic<Long>() {
 
     @CordaInternal
-    data class ExtraConstructorArgs(val recoveryPeers: Collection<Party>,
-                                    val timeWindow: RecoveryTimeWindow? = null,
-                                    val useAllNetworkNodes: Boolean,
-                                    val transactionRole: TransactionRole,
-                                    val dryRun: Boolean,
-                                    val optimisticInitiatorRecovery: Boolean)
+    data class ExtraConstructorArgs(val parameters: LedgerRecoveryParameters)
     @CordaInternal
-    fun getExtraConstructorArgs() = ExtraConstructorArgs(recoveryPeers, timeWindow, useAllNetworkNodes, transactionRole, dryRun, optimisticInitiatorRecovery)
-
-    // unused constructors added to facilitate Node Shell command invocation
-    constructor(recoveryPeer: Party, timeWindow: RecoveryTimeWindow?) : this(setOf(recoveryPeer), timeWindow, false, TransactionRole.ALL, false, false)
-    constructor(recoveryPeer: Party, timeWindow: RecoveryTimeWindow?, dryRun: Boolean) : this(setOf(recoveryPeer), timeWindow, false, TransactionRole.ALL, dryRun, false)
-
-    constructor(timeWindow: RecoveryTimeWindow?, dryRun: Boolean) : this(emptySet(), timeWindow, false, TransactionRole.ALL, dryRun, false)
-    constructor(timeWindow: RecoveryTimeWindow?, dryRun: Boolean, optimisticInitiatorRecovery: Boolean) : this(emptySet(), timeWindow, false, TransactionRole.ALL, dryRun, optimisticInitiatorRecovery)
-    constructor(recoveryPeers: Collection<Party>, timeWindow: RecoveryTimeWindow?, dryRun: Boolean) : this(recoveryPeers, timeWindow, false, TransactionRole.ALL, dryRun, false)
-    constructor(recoveryPeers: Collection<Party>, timeWindow: RecoveryTimeWindow?, dryRun: Boolean, optimisticInitiatorRecovery: Boolean) : this(recoveryPeers, timeWindow, false, TransactionRole.ALL, dryRun, optimisticInitiatorRecovery)
+    fun getExtraConstructorArgs() = ExtraConstructorArgs(parameters)
 
     @Suspendable
     @Throws(LedgerRecoveryException::class)
-    override fun call(): Map<SecureHash, RecoveryResult> {
+    override fun call(): Long {
         throw NotImplementedError("Enterprise only feature")
     }
 }
@@ -59,6 +40,18 @@ class ReceiveLedgerRecoveryFlow constructor(private val otherSideSession: FlowSe
 @CordaSerializable
 class LedgerRecoveryException(message: String) : FlowException("Ledger recovery failed: $message")
 
+data class LedgerRecoveryParameters(
+    val recoveryPeers: Collection<Party>,
+    val timeWindow: RecoveryTimeWindow? = null,
+    val useAllNetworkNodes: Boolean = false,
+    val transactionRole: TransactionRole = TransactionRole.ALL,
+    val dryRun: Boolean = false,
+    val optimisticInitiatorRecovery: Boolean = false,
+    val useTimeWindowNarrowing: Boolean = false,
+    val verboseLogging: Boolean = true,
+    val recoveryBatchSize: Int = 1000
+)
+
 /**
  * This specifies which type of transactions to recover based on the transaction role of the recovering node
  */
@@ -80,6 +73,3 @@ data class RecoveryResult(
         val synchronisedInitiated: Boolean = false,    // only attempted if [optimisticInitiatorRecovery] option set to true and [TransactionRecoveryType.INITIATOR]
         val failureCause: String? = null    // reason why a transaction failed to synchronise
 )
-
-
-
diff --git a/node/src/main/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecovery.kt b/node/src/main/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecovery.kt
index aafd27503e..a85084b288 100644
--- a/node/src/main/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecovery.kt
+++ b/node/src/main/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecovery.kt
@@ -155,7 +155,7 @@ class DBTransactionStorageLedgerRecovery(private val database: CordaPersistence,
             val hashedDistributionList = HashedDistributionList(
                     distributionList.senderStatesToRecord,
                     hashedPeersToStatesToRecord,
-                    HashedDistributionList.PublicHeader(senderRecordingTimestamp)
+                    HashedDistributionList.PublicHeader(senderRecordingTimestamp, timeDiscriminator)
             )
             hashedDistributionList.encrypt(encryptionService)
         }
@@ -170,7 +170,7 @@ class DBTransactionStorageLedgerRecovery(private val database: CordaPersistence,
                 val publicHeader = HashedDistributionList.PublicHeader.unauthenticatedDeserialise(distributionList.opaqueData, encryptionService)
                 database.transaction {
                     val receiverDistributionRecord = DBReceiverDistributionRecord(
-                            Key(partyInfoCache.getPartyIdByCordaX500Name(sender), publicHeader.senderRecordedTimestamp),
+                            Key(partyInfoCache.getPartyIdByCordaX500Name(sender), publicHeader.senderRecordedTimestamp, publicHeader.timeDiscriminator),
                             txId,
                             distributionList.opaqueData,
                             distributionList.receiverStatesToRecord
diff --git a/node/src/main/kotlin/net/corda/node/services/persistence/HashedDistributionList.kt b/node/src/main/kotlin/net/corda/node/services/persistence/HashedDistributionList.kt
index 4f284f11b0..5fee0f24b2 100644
--- a/node/src/main/kotlin/net/corda/node/services/persistence/HashedDistributionList.kt
+++ b/node/src/main/kotlin/net/corda/node/services/persistence/HashedDistributionList.kt
@@ -38,12 +38,14 @@ data class HashedDistributionList(
 
     @CordaSerializable
     data class PublicHeader(
-        val senderRecordedTimestamp: Instant
+        val senderRecordedTimestamp: Instant,
+        val timeDiscriminator: Int
     ) {
         fun serialise(): ByteArray {
-            val buffer = ByteBuffer.allocate(1 + java.lang.Long.BYTES)
+            val buffer = ByteBuffer.allocate(1 + java.lang.Long.BYTES + Integer.BYTES)
             buffer.put(VERSION_TAG.toByte())
             buffer.putLong(senderRecordedTimestamp.toEpochMilli())
+            buffer.putInt(timeDiscriminator)
             return buffer.array()
         }
 
@@ -67,7 +69,8 @@ data class HashedDistributionList(
                     val version = buffer.get().toInt()
                     require(version == VERSION_TAG) { "Unknown distribution list format $version" }
                     val senderRecordedTimestamp = Instant.ofEpochMilli(buffer.getLong())
-                    return PublicHeader(senderRecordedTimestamp)
+                    val timeDiscriminator = buffer.getInt()
+                    return PublicHeader(senderRecordedTimestamp, timeDiscriminator)
                 } catch (e: Exception) {
                     throw IllegalArgumentException("Corrupt or not a distribution list header", e)
                 }
diff --git a/node/src/test/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecoveryTests.kt b/node/src/test/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecoveryTests.kt
index debc39d102..85e086ad61 100644
--- a/node/src/test/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecoveryTests.kt
+++ b/node/src/test/kotlin/net/corda/node/services/persistence/DBTransactionStorageLedgerRecoveryTests.kt
@@ -320,7 +320,7 @@ class DBTransactionStorageLedgerRecoveryTests {
         val hashedDistList = HashedDistributionList(
                 ALL_VISIBLE,
                 mapOf(SecureHash.sha256(BOB.name.toString()) to NONE, SecureHash.sha256(CHARLIE_NAME.toString()) to ONLY_RELEVANT),
-                HashedDistributionList.PublicHeader(now())
+                HashedDistributionList.PublicHeader(now(), 1)
         )
         val roundtrip = HashedDistributionList.decrypt(hashedDistList.encrypt(encryptionService), encryptionService)
         assertThat(roundtrip).isEqualTo(hashedDistList)