no , it will not include 24 hour callout.
however, if and when you need someone to fix a problem, which is pretty unlikely if you get a worcester bosch installed properly, wb will send someone the next working day and he WILL fix the problem.
from many posts on the forum it appears that bg's first action is to send a trainee.
countless cases of having to wait days if not weeks until finally they send what they call a senior engineer.
and every time that means taking at least half a day off.
some evidence please
seems to be more posts on here about independants lately
and as op has pointed out he allready knows the score with us.