For some time l have been going through the files on the FV 1600 family of vehicles while l have a number of records and photographs of most including 08/09/21/22 . The FV 1606 if it did exist may have only been in the mock up stage as a large number of projects did and it was normal practise to reduce to product in other words broken up a few did survive if it did make to mock up it may be in the list of mock up vehicles which l do not have at home