A visit starts with a look at the opening - width, height, headroom above the door, and whatever track and spring setup is currently in there. For Manchester specifically, that's usually quick, since most of the housing stock shares the same era and the same handful of standard opening sizes. Bring any opener manual or door brand info you have on hand if the house still has its original paperwork from the build; it saves a step.
You can see the areas this covers at the service area page, and if the job turns out to be something other than installation - a repair, a spring swap, an opener issue - the broader rundown of what's offered out of York is on the York installation page. This page is specifically about putting in a new door for a Manchester house; anything that stays a repair job gets handled differently.