We love UK holidays.
I love going abroad (in theory) but making sure the bags aren't overweight, waiting around airports, security, trying to do self catering buying the basics when you're hot, tired and don't speak (much) of the country's language is hard work (I remember a celeb on a programme saying they bought a tin of cat food by mistake thinking it was a tin of tuna for lunch in one country as they went by the fish on the tin!)
Just dumping everything in the car, running back inside to grab a last toy for DS when he was younger and bunging it on the luggage without having to try to cram it into a suitcase is bliss! Being able to walk into any supermarket, know what I'm looking for for a picnic lunch or breakfast and be able to read road signs etc just used to take all the work away for us.
I've been sunburnt on Loch Ness, travelled home from Cornwall in 30 degree heat (uggghh) and, yes, got soggy in the Lake District. But you know, that's what rain gear is for and we got caught in a monsoon like rain storm in Florida a few years back. If you're dressed for it (or have put some wet weather gear in the back of the car) you're all set. Easy.
Pop lots of stops off on the way so you can see some other areas. We did Bosworth Field on the way back from the Lakes one year - never have done that otherwise and it was fantastic. We did Morecambe on the way up. Just for a few hours, but it's given us ideas for other areas to explore.
So, places we've enjoyed.
Cornwall, Devon, Somerset, Hampshire (New Forest/Winchester), Wiltshire (Salisbury and Stonehenge area), Scotland (Edinburgh, Glasgow, Highlands, Aviemore and the Cairngorms - if you go, go and see the Reindeer wild on the mountains...marvellous), Oxford, York, Northumberland (Holy Island is lovely and, if you like that sort of thing, Vindolanda and the other Roman Forts along Hadrian's Wall are interesting), Warwick, Leeds (Kent) and Alnwick Castles are interesting, Blenheim Palace and Stratford Upon Avon. Loads of lovely villages around East and West Sussex and Kent and lovely sea side towns to explore.
We've had some lovely foreign holidays - been lucky enough to travel as far afield as Australia amongst others but they can be hard work to start with.
We've ever had a bad UK holiday. We've had some wet ones but usually only a day or two so we use those times to do the stately homes/castles etc.