Hi Russell,
The No.3 Control Units I have all have the English and Russian cyrillic letters on them, I believe these were largely made in the US by RCA for Lend Lease. As far as I know these boxes were made in the US as you rarely find them with some form of US manufacturers marks. The truly British made sets were made if I'm correct by Pye and are very distinct in their colour and markings. I wish you good luck in finding what you are looking for and keep checking ebay.co.uk for new listings.
Cheers,
Patrick
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