Our bathroom currently has no equipotential bonding, and I am aware
that in order to comply with the regs I will either need to install
equipotential bonding or upgrade my installation to meet the 17th
edition regs.

..
there should be a bonding wire onto the plumbing somewhere,
i think there's a problem when some of the metal pipe is replaced with
plastic,
so the bonding doesnt reach the bath..

[g]