A few points;

There are only two major players left in the biz now, Autoglass and Auto Windscreens (since the owners of Auto Windscreens bought the glass service from the AA, removing their brand from the pool). Both have pretty long wait times currently. Autoglass is typically 3-4 weeks, and AW varies depending on location, but I've been going out to screens recently for customers that have been waiting 3/4/5/6 weeks. Reason I say this is you mentioned your MOT - you should book this replacement now so as to get it done before MOT is due - and I'm guessing you'll need to MOT it before xmas since it's unlikely you'll get it done much over the the xmas break...

Next, the screen itself. Someone else mentioned Pilks, it varies on model, but you're either looking at a Saint Gobain or Pilkington as the OEM manufacturer of glass for Ford. In regard to the heating element and sensors (sensors are part of the car, they are just removed from the old screen and fitted to the new one, heater terminals are simply plugged in) you need to be 100% sure of what you have if you want to minimise the possibility of someone turning up with the wrong glass - it happens, cars are much more complex than they used to be, and there's a shit load more options than back in the day. You can have rain sensors, light sensors, lane departure cameras, infra-red cameras, vapour sensors, all sorts.

Lastly, dealer part or not. Most insurance companies won't pay the extra for a dealer part screen when they know they can get a Pilk, or whatever, for considerably less. Some will agree to it only if you pay the difference. However, if you insist enough, some will do it for cars under 3 years old, so worth making a fuss. However, expect a longer wait time as the glass will have to be an outside purchase through a supply network - not "off the shelf" for overnight delivery as most glass is.

What you have more to worry about is who's fitting it. Autoglass have suffered huge amounts of their techs leaving of recent years, and they have a very high concentration of trainee techs out on the roads currently. This wasn't so bad 5-6 years ago when trainees went to fitting school for two weeks, then assigned to an experienced tech for 6 months before being assessed and signed off, but nowadays they do the training school for sometimes as little as a week and then put out on road with another tech for as little as a couple weeks, before being let loose on cars all on their own - before being signed off. The other company has a mixed bag of techs - all of the now ex-AA techs are ATA trained and qualified and currently up to date, but the nearly all of the AW techs don't have any qualifications. Now that's not to say they cannot fit, it just means they haven't been put through or trained for an ATA. Or an NVQ, as it seems they stopped bothering with that a few years ago too. Like any company, they have both good and bad fitters. I'm not trying to scare the shit out of you, just telling it like it is.