I've just spent a week on the Isle of Arran (Ayrshire), without a doubt the nicest and most polite place I've cycled. I only managed two rides as it wasn't a cycling holiday but I'll be returning. Arran seems to have its own road code given the smaller roads, and lack of traffic. Both drivers and cyclists seem to interact well with each other, there is even something call the 'e-bike network' which is a series of shops and places that will charge your batteries.
Of course, there were some occassional hooligans (read the sign lol)
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I'm not long back from Arran myself and have to say I love it. One of my favourite places to cycle. Kintyre and Islay are great too.