From memory, the bog-standard installation time is 2hrs - that is for work carried out the minute they start on your premises.
IE: they could spend all day up the telegraph pole, or down the road in a joint-box, the 2hrs doesn't start until work commences at the premises.
I would be shouting from the rooftops that you have not had anything like a 'Great customer experience' (this is a priority with Openreach). The untwisted dropwire from the overhead closure should absolutely have been replaced from latest spec dropwire, and you are well within your rights to ask for the master socket to be relocated wherever the hell you want it .......... so long as it falls within the 2hr remit.
If however, the engineer thinks the job would take 3/4/5 hrs to achieve this, he could send the job back requesting the CP apply 'Time Related Charges' (TRC) to the job with an estimate of how long the task would take, and then have the CP re-allocate the task with a new appointment date.
Please, can 'we' not have a lengthy debate about how one engineer may be quicker than another at working - been there, done that, got very boring.
In summary, insist another engineer attend site and do the job properly and fit the master socket where you want it to go.