Husband and I plan on arriving in UK September 2019 for a 3 month touring holiday (self-drive). Will start in Scotland (while it's still a little mild), then Ireland, Wales and finish in England. We will be staying in self-sufficient holiday lets for a week at a time at strategic spots, and using them as home bases for day trips, rather than spending days driving from one spot to the next. Has anyone done anything like this? Looking for suggestions on key towns to stay, reliable hire car companies, tips, advice, etc.