The stuff on equipotential bonding in bathrooms has changed with the
17th edition of the wiring regs.

If the supply is fully rcd protected in that location, the requirement
is reduced or eliminated.

(I also noticed that the head of article says "by Paul Cook of the
Institute of Electrical Engineers", but it links to the IEEE - the
american institution. The name of ours has also changed to the IET,
Institute of Engineering Technology)