diff --git a/packages/metadata/src/Metadata/util/extractTypes.ts b/packages/metadata/src/Metadata/util/extractTypes.ts
new file mode 100644
index 0000000000..92f7824350
--- /dev/null
+++ b/packages/metadata/src/Metadata/util/extractTypes.ts
@@ -0,0 +1,37 @@
+// Copyright 2017-2020 @polkadot/metadata authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { TypeDef, TypeDefInfo } from '@polkadot/types/types';
+
+import { getTypeDef } from '@polkadot/types/create';
+
+type Extracted = string | Extracted[];
+
+/** @internal */
+export default function extractTypes (types: string[]): Extracted[] {
+  return types.map((type): Extracted => {
+    const decoded = getTypeDef(type);
+
+    switch (decoded.info) {
+      case TypeDefInfo.Plain:
+        return decoded.type;
+
+      case TypeDefInfo.BTreeSet:
+      case TypeDefInfo.Compact:
+      case TypeDefInfo.Option:
+      case TypeDefInfo.Vec:
+      case TypeDefInfo.VecFixed:
+        return extractTypes([(decoded.sub as TypeDef).type]);
+
+      case TypeDefInfo.BTreeMap:
+      case TypeDefInfo.HashMap:
+      case TypeDefInfo.Result:
+      case TypeDefInfo.Tuple:
+        return extractTypes((decoded.sub as TypeDef[]).map((sub): string => sub.type));
+
+      default:
+        throw new Error(`Unhandled: Unable to create and validate type from ${type}`);
+    }
+  });
+}
diff --git a/packages/metadata/src/Metadata/util/validateTypes.ts b/packages/metadata/src/Metadata/util/validateTypes.ts
index 51aeefb85d..1bbd133835 100644
--- a/packages/metadata/src/Metadata/util/validateTypes.ts
+++ b/packages/metadata/src/Metadata/util/validateTypes.ts
@@ -2,42 +2,11 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { Registry, TypeDef, TypeDefInfo } from '@polkadot/types/types';
-
-import { getTypeDef } from '@polkadot/types/create';
+import { Registry } from '@polkadot/types/types';
 
+import extractTypes from './extractTypes';
 import flattenUniq from './flattenUniq';
 
-type Extracted = string | Extracted[];
-
-/** @internal */
-function extractTypes (types: string[]): Extracted[] {
-  return types.map((type): Extracted => {
-    const decoded = getTypeDef(type);
-
-    switch (decoded.info) {
-      case TypeDefInfo.Plain:
-        return decoded.type;
-
-      case TypeDefInfo.BTreeSet:
-      case TypeDefInfo.Compact:
-      case TypeDefInfo.Option:
-      case TypeDefInfo.Vec:
-      case TypeDefInfo.VecFixed:
-        return extractTypes([(decoded.sub as TypeDef).type]);
-
-      case TypeDefInfo.BTreeMap:
-      case TypeDefInfo.HashMap:
-      case TypeDefInfo.Result:
-      case TypeDefInfo.Tuple:
-        return extractTypes((decoded.sub as TypeDef[]).map((sub): string => sub.type));
-
-      default:
-        throw new Error(`Unhandled: Unable to create and validate type from ${type}`);
-    }
-  });
-}
-
 /** @internal */
 export default function validateTypes (registry: Registry, types: string[], throwError: boolean): void {
   const missing = flattenUniq(extractTypes(types)).filter((type) => !registry.hasType(type));
diff --git a/packages/metadata/src/Metadata/v11/static-substrate.json b/packages/metadata/src/Metadata/v11/static-substrate.json
index 6bbeaaaf3e..1f1b05e842 100644
--- a/packages/metadata/src/Metadata/v11/static-substrate.json
+++ b/packages/metadata/src/Metadata/v11/static-substrate.json
@@ -10780,7 +10780,7 @@
                   "Map": {
                     "hasher": "Twox64Concat",
                     "key": "AccountId",
-                    "value": "(Vec<Announcement>,BalanceOf)",
+                    "value": "(Vec<ProxyAnnouncement>,BalanceOf)",
                     "linked": false
                   }
                 },
diff --git a/packages/metadata/src/Metadata/v11/toLatest.ts b/packages/metadata/src/Metadata/v11/toLatest.ts
index 8084680416..65ad8bdee4 100644
--- a/packages/metadata/src/Metadata/v11/toLatest.ts
+++ b/packages/metadata/src/Metadata/v11/toLatest.ts
@@ -16,10 +16,20 @@ import { stringCamelCase } from '@polkadot/util';
  * @internal
  **/
 function setTypeOverride (sectionTypes: OverrideModuleType, type: Type): void {
-  const override = Object.keys(sectionTypes).find((aliased): boolean => type.eq(aliased));
+  const override = Object.keys(sectionTypes).find((aliased) => type.eq(aliased));
 
   if (override) {
     type.setOverride(sectionTypes[override]);
+  } else {
+    // FIXME: NOT happy with this approach, but gets over the initial hump cased by (Vec<Announcement>,BalanceOf)
+    const orig = type.toString();
+    const alias = Object.entries(sectionTypes).reduce((result: string, [from, to]): string =>
+      [['<', '>'], ['<', ','], [',', '>'], ['(', ')'], ['(', ','], [',', ','], [',', ')']].reduce((result, [one, two]): string =>
+        result.replace(`${one}${from}${two}`, `${one}${to}${two}`), result), orig);
+
+    if (orig !== alias) {
+      type.setOverride(alias);
+    }
   }
 }
 
@@ -29,7 +39,7 @@ function setTypeOverride (sectionTypes: OverrideModuleType, type: Type): void {
  **/
 function convertCalls (registry: Registry, calls: FunctionMetadataV11[], sectionTypes: OverrideModuleType): FunctionMetadataLatest[] {
   return calls.map(({ args, documentation, name }): FunctionMetadataLatest => {
-    args.forEach(({ type }): void => setTypeOverride(sectionTypes, type));
+    args.forEach(({ type }) => setTypeOverride(sectionTypes, type));
 
     return registry.createType('FunctionMetadataLatest', { args, documentation, name });
   });
@@ -41,7 +51,7 @@ function convertCalls (registry: Registry, calls: FunctionMetadataV11[], section
  **/
 function convertEvents (registry: Registry, events: EventMetadataV11[], sectionTypes: OverrideModuleType): EventMetadataLatest[] {
   return events.map(({ args, documentation, name }): EventMetadataLatest => {
-    args.forEach((type): void => setTypeOverride(sectionTypes, type));
+    args.forEach((type) => setTypeOverride(sectionTypes, type));
 
     return registry.createType('EventMetadataLatest', { args, documentation, name });
   });
diff --git a/packages/types/src/create/sanitize.spec.ts b/packages/types/src/create/sanitize.spec.ts
index 04452dd10e..72a848ac11 100644
--- a/packages/types/src/create/sanitize.spec.ts
+++ b/packages/types/src/create/sanitize.spec.ts
@@ -26,6 +26,14 @@ describe('sanitize', (): void => {
         'Text Text (Text,[Text;32],Text)"Text<Text>'
       );
     });
+
+    it('handles emdedded Vec/Tuples', (): void => {
+      const ann = alias(['Announcement'], 'ProxyAnnouncement');
+
+      expect(ann('(Vec<Announcement>,BalanceOf)')).toEqual(
+        '(Vec<ProxyAnnouncement>,BalanceOf)'
+      );
+    });
   });
 
   describe('removeColons', (): void => {
diff --git a/packages/types/src/interfaces/proxy/definitions.ts b/packages/types/src/interfaces/proxy/definitions.ts
index 4498be5332..25b6036f57 100644
--- a/packages/types/src/interfaces/proxy/definitions.ts
+++ b/packages/types/src/interfaces/proxy/definitions.ts
@@ -22,8 +22,6 @@ export default {
       real: 'AccountId',
       callHash: 'Hash',
       height: 'BlockNumber'
-    },
-    // FIXME We don't want this here
-    Announcement: 'ProxyAnnouncement'
+    }
   }
 } as Definitions;