Thanks for the advice. I decided I *wanted* a circular saw. It did help me remove the bath panel, although I also used a hacksaw blade, drill and 24" wrecking bar (one of the best tools I've ever bought

) - turns out the 'panel was also fitted before the floor tiles were laid. It had also swollen from absorbing water.
From then on it was just a case of disconnecting the water pipes, fitting nice brass backnuts (eBay, £4), and reconnecting the pipes. Then disconnecting the pipes again in a hurry because the "flexible tap connector washers" don't work with the flexible pipe; it needs "hose washers".
But all I have to do now is get a new bath panel, repair the damage to the walls, paint the walls (the masking tape that I used to hold a dustsheet in place has taken some of the paint off the walls), and repair some of the floor tile grouting, then the jobs a good'un.
Let this be a warning to you all - if you buy taps and they have plastic backnuts, get some brass ones and use them instead. Plastic is great, but not for this application (and don't get me started on it's use for securing toilet seat fixings)
At least I got to drive my little van to Toolmaster and (repeatedly) to Wickes
