Eureka!
We have success I found a BT cable I had hanging around at the back of a drawer and connected it up as shown in the photo and Bingo! we have a working phone.
Now I can get on with restoring it tidying up the cabling and using it
A few questions if you can indulge me ?
1) I need some form of ringer internally to the phone, from above this needs to connect across terminals but I have no idea which or what voltage ?
2) Any suggestions for some form of internal bell? I have seen some lttle Chang Chengs(?) but cant for the life of me find one to buy.
3) The hang up T-bar looks like a differnt material to the rest of the phone any special treatment needed for hand polishing this bit ?
Thanks for all your help guys I am a happy bunny just need to finiosh off my little project now.
Dave