As a broker we use 40+ insurers and their approved repairers, their terms etc all vary slightly as do their repairers - as I say, if you pm me your postcode (as I don't want you posting personal information publicly) I can find out who did the call, and listen to it if needed. All feedback is welcomed, as if the call wasn't satisfactory then we can highlight any areas for further training also.
We do usually say, for example with kit cars, I know some of these questions may not be fully relevant but we do have to ask them such as "how many doors" - now most kits have no doors, but occasionally people do fit doors. When asking if there's any mods a few do get missed off the list occasionally and the individual questions often prompt their memory. As an example, I've spoken to someone recently who forgot about the gearbox change and it was when I asked auto/manual they said, "oh auto, but it used to be manual, sorry can you add that to the mods list" - that's quite a big one to miss off. It just allows us to ensure that the cover we are offering is the right one for you and your car, and nothing is missed off for the insurers to query in a claim. Essentially, we are making sure that if something were to happen then we have the confidence that the information is fully correct. The registration doesn't always pull through the correct information in terms of engine size for example, and a soon as people hear the make and model they often just say "yep" before we've said the other details - this makes sure what we have on your policy documents is accurate. We've actually had NCB proof sent to us from other brokers/insurers which shows the vehicle details incorrect - so we've called the client to check it and it would turn out they've been insured with incorrect models, incorrect vehicle registration year and all sorts for years because they never took a thorough look at the documents (it happens).
Depending on the insurers quoted with, the windscreen approved repairer is likely to be either through National Windscreens who most insurers use or Auto Windscreens who some insurers use. A handful use other repairers such as Autoglass, but majority use National Windscreens.