The Natural Philosopher wrote in
:

- On the ground, the average BT engineer is a nice bloke, and, if
supplied with coffee tea and biscuits and intelligent discussion
of the World Cup, won't bat an eyelid at any installation that
palpably works and is well put together.

That has been my experience too, with them even bending the rules about
what is internal and what is external so as not to have BT charge me.
Most of them are ex-BT people working on a contract anyway, it seems,
so it's all the same to them.