ok, to save going round this loop any more, I have added the following
words to the earthing and bonding article:

On the subject of main bonding:

"Note that if the main bonding is not present, it is considered to be a
serious electrical fault. As a result anyone carrying out modifications
to any part of an electrical installation should also check and rectify
any faults in this area at the same time. Note that although there is no
general legal obligation on house owners to upgrade the electrical
system to meet the current requirements as laid down in BS7671 (the
"wiring regs"), it is not uncommon for professional electricians to
refuse to undertake any other work unless their are also instructed to
perform any required remedial work on the main bonding at the same time."

and on the supplementary bonding bit:

"Again a householder is not legally obliged to upgrade or install
supplementary bonding when it is required (by the wiring regs) but
missing, (or in some other way substandard), unless they are carrying
out other work in the same room. "

I have also added a note to the bathroom article to the effect:

"One should also keep in mind that a room containing a bath or shower is
classed under Part P of the building regulations as a "special
location". This means that other than like for like changes of
accessories etc, or the installation / upgrading of supplementary
bonding, nearly all electrical work will be classed as a "major work"
for the purposes of part P. Hence to comply with the requirements the
work would need to be carried out under a building notice, or completed
by a person who is a member of one of the various part P competent
persons schemes. "

--
Cheers,

John.

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