Hi Benji.
I dont really think I can be of much help but you could try dropping a line
to Bernard Wichert in Germany ( in English is ok for him ! ) at :
b_wi...@gmx.de
He has a large knowledge of radio so might be able to help.
In the early days, some US stations in the 1920's occasionally relayed BBC
programmes from London.
The BBC Written Archives might be able to help you with copies of early
documents. Write to:
julie.s...@bbc.co.uk
Please mention my name if you do write to these two people !
I'd be interested to know where you got my e-mail address from. I dont know
the website at all. Can you send me some more info on it ?
Best Wishes from Scotland.
Graeme.