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I think you can get a British TV to work on American standards by increasing the horizontal and vertical frequencies with the hold controls (called line hold and frame hold on British sets). The black and white signal is the same (or similar enough to work) in the British and American standards, only the scanning frequency is different. It is the British color signal (PAL) which cannot be picked up on American color TV's, it is too different.
I don't know about the RF frequencies of British TV channels...I know that the 405-line standard was VHF and all of the modern 625 line color transmissions are UHF. You may be able to inject video from a VCR with an alligator clip lead to the video detector to try the set out. You may need to use an isolation xfmr to power the set if it a "hot chassis".
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