On 26 Jan, 23:16, wrote:
The wife often lets our 6 year soak in the bath water while
the shower continues to flow whilst submerged.

Thought that was against water regulations because of possible back
syphoning ?

Water By Laws (AIUI) control the _positioning_ of the shower, such
that the hose won't have enough reach to allow this to happen. They
recognise that they haven't a hope of controlling people's behaviour
when using it.

So it was Arthur's (possibly a plumber's, but this is uk.d-i-y) fault,
not his wife's.