tenpinn
None of us mind people driving at 25mph providing they obey the law. That, unfortunately, is what a lot of people don't do and in doing so they are guilty of obstruction and cause accidents for example by diving into a passing place on the right when they should stay on the left opposite the passing place.
They also often don't use their mirrors and realise the traffic is piling up behind them - it is an offence not to pull in (obviously when there's a clear line of sight to make it safe) and let faster traffic pass.
We don't drive at m-way speeds, but we do know the roads, the dangerous spots/times of day/year and where the passing places are and are prepared for sheep, lambs, cows and deer on the road. And we have livelihoods; we have hospital and other appointments just like other folk. You may not believe this, though it's true, during the summer I had to take my disabled mum to hospital (near but not on a bus route!!) for an appointment. We left an hour before it was due to travel 10 miles and got there with five minutes to spare - all because of inconsiderate and illegal driving!
Argyll & Bute Council has produced, with the police, a leaflet for visitors about driving on single track roads but, even with them being freely available and with announcements made on ferries, many folks just don't bother. We have only got five policemen - they can't be everywhere!
It's not the 25mph but the refusal to obey the law and still drive at 25mph that is the problem!