Hi,
JB Restorations are known to me and have done work for me in the past. Their speciality are pre-unit gearboxes. I have found the chap who runs the company very helpful and his work is of a high standard. Can't recall what his name is. JB restorations were recommended to me by C & D Autos so I guess he has a good reputation. I do recall having a conversation with him about end feed conversions and from what I recall he has a contact in the Newcastle who carries out this work.
Regards
Simon