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From memory, this was done at the ATV studios in Wembley, on the outskirts of London. The UK barely had colour at that point and good PAL to NTSC standards conversion simply didn't exist then. If you wanted to shoot for both the UK and US market you could do it on film or you could have NTSC colour cameras working alongside 625 line monochrome ones.
Not sure if this 100% accurate (I'm on holiday and away from my reference books) but it's along the right lines.
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