I have arranged to have my gas and leccy meters changed for the Smart
versions. As I don't have an isolator upstream of my consumer unit, I
thought it would be a good time to have one fitted, so enquired if that
could be done at the same time if I supplied and mounted a suitable
isolator in the cabinet.

The reply from my supplier astounded me - Their engineers are only
trained to swap the meters, they are not qualified to do anything else.
Swapping meters is likely the most dangerous job on a domestic
installation, with some very serious safety implications if they do get
it wrong.

They indicated they would need to engage another 'specialised engineer'
to do it, at a cost to me of £70. Good grief what is the world coming
to?