For a competent professional capable of actually doing the job to a reasonable standard, to shoot a full day I would think that £2000 would be at the lower end of scale, especially in the Highlands and Islands. Travel is not always easy, or cheap in that part of the UK, and the population is pretty thin on the ground up there too. You need to consider that in the highlands and islands lots of things a much more expensive than in the rest of the UK. Interestingly I was looking at the carriage charges for the pro lab that I use, and while the rest of the UK can get next working day courier delivery with a 1 Hr time slot for £9.99 for that area of Scotland its a 1 to 2 day service and it costs £19.99, twice the price for half the service, and that is on the mainland too, just because it is remote. That will apply to just about everything that has to be sent to those areas. I believe that there are some places in the highlands where villages or towns might be 10 or 15 miles apart as the crow flies, but it is a 100 mile drive to get there, all on single track lanes. If you are working as a wedding photographer, and making almost all of your income that way you are not going to be making great money charging £2000 per wedding. Even if you book a wedding every week during the main wedding season in the UK that is going to be 26 weddings a year, since the season is about 6 months. That is gross takings of £52000, at which point one would have to wonder if charging "only" £2000 per event was actually sustainable.
Of course if you look hard enough I'm sure you could find a GWAC, or even a MWAC that will offer shoot and burn for £750 or even £500 maybe even less, but will they even be capable of doing that successfully? I got married back in 1987, and we went with a good mid range pro for the photography and IIRC it cost us about £500, for the getting ready shots, ceremony and formals at the church, the speeches at the breakfast, and then some shots of the evening do including the cake cut etc. I'd expect to pay about £5000 for that now.
Alan