There is a good one in Volkswagen Gatwick that fits the bill. Anybody had dealings with them ?
My only advice, check it's actually for sale!
There's a long story behind me getting my car (ordered before WLTP shutdown in the summer of 2018, delayed, cancelled, finally arrived out of the blue Christmas 2018), but in the time I had cancelled my order I was looking for used examples that had DCC/Dynaudio/19's and leather). My GF lives a few miles from Gatwick VW and they had a car for sale (on the VW website with a screen price etc) which had a similar spec to the car I'd ordered, albeit it was white. So I popped down to see it, rang ahead to let them know I was coming yet when I turned up I couldn't see it anywhere, so I assumed it was a demo probably parked out back or with a salesperson. I walked into the showroom and sat around waiting for about an hour as the various salesman tried to track down the car on various systems yet to no avail, it was like the car didn't exist. The third salesman then came over and said he'd found it parked out the back. We went out the back and it was filthy (inside and out) and clearly in use, and here's the clincher for me.... as the salesman was inside trying to find the key for me to look over it a guy came out of the workshop and tried to get into it to drive off. I said that I was about to test drive it, to which he replied "no you're not mate it's my car!". The salesman came back out and he was ushered away by this mysterious man. The salesman then came back with the key and let me look over it.
I said I was interested, but wanted to drive it, to which he said I could but the car was being used by the Work shop Director and I could drive it when he came back from lunch. All this seemed very weird, so when we were inside I asked the salesman to show me the car on their system as available to purchase immediately. He brought up a scree on a business fleet system (not retail!) and it said the car couldn't be sold for another 6 months! As you can imagine I flew off the handle and asked why they were advertising a car they couldn't actually sell. The salesman was hugely apologetic, but he said his hands were tied due to them not being able to sell demo cars for a fixed amount of time.
I walked away and lost the best part of a day there for nothing. Granted, an isolated incident, but it put me off going back there, so tread with caution as it appears they advertise cars well in advance of actually being able to sell them!