diff --git a/build.sbt b/build.sbt
index c1d28b5f..8b3024f7 100644
--- a/build.sbt
+++ b/build.sbt
@@ -61,7 +61,8 @@ def faciaJson(playJsonVersion: PlayJsonVersion) = playJsonSpecificProject("facia
       commonsIo,
       playJsonVersion.lib,
       "org.scala-lang.modules" %% "scala-collection-compat" % "2.11.0",
-      scalaLogging
+      scalaLogging,
+      playJsonExtensions
     ),
     artifactProducingSettings(supportScala3 = playJsonVersion.supportsScala3)
   )
@@ -73,7 +74,7 @@ def fapiClient(playJsonVersion: PlayJsonVersion) =  playJsonSpecificProject("fap
       contentApiDefault,
       commercialShared,
       scalaTestMockito,
-      mockito
+      mockito,
     ),
     artifactProducingSettings(supportScala3 = false) // currently blocked by contentApi & commercialShared clients
   )
diff --git a/facia-json/src/main/scala/com/gu/facia/client/models/Config.scala b/facia-json/src/main/scala/com/gu/facia/client/models/Config.scala
index 5dceb91b..83e626b7 100644
--- a/facia-json/src/main/scala/com/gu/facia/client/models/Config.scala
+++ b/facia-json/src/main/scala/com/gu/facia/client/models/Config.scala
@@ -1,7 +1,9 @@
 package com.gu.facia.client.models
 
+import ai.x.play.json.Encoders.encoder
 import com.typesafe.scalalogging.StrictLogging
 import play.api.libs.json._
+import ai.x.play.json.Jsonx
 
 object Backfill {
   implicit val jsonFormat: OFormat[Backfill] = Json.format[Backfill]
@@ -201,7 +203,7 @@ object DisplayHintsJson {
 case class DisplayHintsJson(maxItemsToDisplay: Option[Int])
 
 object CollectionConfigJson {
-  implicit val jsonFormat: OFormat[CollectionConfigJson] = Json.format[CollectionConfigJson]
+  implicit val jsonFormat: OFormat[CollectionConfigJson] = Jsonx.formatCaseClass[CollectionConfigJson]
 
   val emptyConfig: CollectionConfigJson = withDefaults(None, None, None, None, None, None, None, None, None, None, None, None)
 
@@ -227,7 +229,9 @@ object CollectionConfigJson {
     targetedTerritory: Option[TargetedTerritory] = None,
     platform: Option[CollectionPlatform] = None,
     frontsToolSettings: Option[FrontsToolSettings] = None,
-    suppressImages: Option[Boolean] = None
+    suppressImages: Option[Boolean] = None,
+    containerStyle: Option[String] = None,
+    imageAspectRatio: Option[String] = None
   ): CollectionConfigJson
     = CollectionConfigJson(
     displayName,
@@ -251,8 +255,9 @@ object CollectionConfigJson {
     targetedTerritory,
     platform,
     frontsToolSettings,
-    suppressImages
-  )
+    suppressImages,
+    containerStyle,
+    imageAspectRatio)
 }
 
 case class CollectionConfigJson(
@@ -277,7 +282,9 @@ case class CollectionConfigJson(
   targetedTerritory: Option[TargetedTerritory],
   platform: Option[CollectionPlatform],
   frontsToolSettings: Option[FrontsToolSettings],
-  suppressImages: Option[Boolean]
+  suppressImages: Option[Boolean],
+  containerStyle: Option[String],
+  imageAspectRatio: Option[String]
   ) {
   val collectionType = `type`
 }
diff --git a/fapi-client/src/main/scala/com/gu/facia/api/models/collectionconfig.scala b/fapi-client/src/main/scala/com/gu/facia/api/models/collectionconfig.scala
index 35ee87b5..c92b029b 100644
--- a/fapi-client/src/main/scala/com/gu/facia/api/models/collectionconfig.scala
+++ b/fapi-client/src/main/scala/com/gu/facia/api/models/collectionconfig.scala
@@ -35,7 +35,9 @@ case class CollectionConfig(
     targetedTerritory: Option[TargetedTerritory],
     platform: CollectionPlatform = AnyPlatform,
     frontsToolSettings: Option[FrontsToolSettings],
-    suppressImages: Boolean)
+    suppressImages: Boolean,
+    containerStyle: Option[String],
+    imageAspectRatio: Option[String])
 
 object CollectionConfig {
   val DefaultCollectionType = "fixed/small/slow-IV"
@@ -62,7 +64,9 @@ object CollectionConfig {
     targetedTerritory = None,
     platform = AnyPlatform,
     frontsToolSettings = None,
-    suppressImages = false)
+    suppressImages = false,
+    containerStyle = None,
+    imageAspectRatio = None)
 
   def fromCollectionJson(collectionJson: CollectionConfigJson): CollectionConfig =
     CollectionConfig(
@@ -87,5 +91,7 @@ object CollectionConfig {
       collectionJson.targetedTerritory,
       collectionJson.platform.getOrElse(AnyPlatform),
       collectionJson.frontsToolSettings,
-      collectionJson.suppressImages.exists(identity))
+      collectionJson.suppressImages.exists(identity),
+      collectionJson.containerStyle,
+      collectionJson.imageAspectRatio)
 }
diff --git a/project/dependencies.scala b/project/dependencies.scala
index 71171aa1..f4627651 100644
--- a/project/dependencies.scala
+++ b/project/dependencies.scala
@@ -12,6 +12,7 @@ object Dependencies {
   val scalaTest = "org.scalatest" %% "scalatest" % "3.2.18" % Test
   val scalaLogging = "com.typesafe.scala-logging" %% "scala-logging" % "3.9.5"
   val commercialShared = "com.gu" %% "commercial-shared" % "6.1.8"
+  val playJsonExtensions = "ai.x" %% "play-json-extensions" % "0.42.0"
 
   case class PlayJsonVersion(
     majorMinorVersion: String,