You might try an enquiry mail to either of these

http://www.teglondon.co.uk/

http://www.casecraft.co.uk/

I have no direct experience of either, but Purdey would be expensive; my guess is that they would sub-contract to a specialist business - which might even be one of these.

Last edited by JohnfromUK; 07/09/16 04:30 AM.