Right, now I'm back home after Christmas and have measured the hole
centres ready for the new mixer tap-cum-shower attachment. They're
180mm apart, so it does look like a standard measurement.

Next question: I slipped off the side of the bath to have a butchers
and lo and behold, the existing taps have braided hoses! So, correct
me if I'm wrong, but this should make installation of the new mixer
even more of a doddle, no?

Can I re-use the same hoses? What about new sealing washers? Plumbfix,
maybe?

MM