Your UK/European PAL TV will not receive US NTSC signals at all, unless you do one of 2 things:
1. Have an NTSC tuner fitted instead of your PAL tuner - I'm not sure if B&O will even do this.
OR
2. Buy a PAL/NTSC MultiSystem VCR of any brand, and use the VCR's NTSC tuner to receive the NTSC signal from cable or airwaves; Then setup the MultiSystem VCR to convert the NTSC signal to PAL; Then pass that PAL signal to your PAL TV via the Composite Yellow RCA connector.
Essentially, you are using the VCR's MultiSystem tuner to receive the NTSC signal and process it, and then you are feeding that signal (now PAL) directly to your CRT monitor, bypassing the Beovision's (now useless) PAL tuner.
BTW, you'll need at least a 600VA step-up transformer, if you want the system running cool.
Menahem
Learn from the mistakes of others - you'll not live long enough to make them all yourself!