A bit. I recently had a mini break last month up to Scotland and stayed in Dumfries and Galloway, visiting the atypical Isle of Arran (I know Ayrshire), Portpatrick, and going up the Rhins of Galloway heading to the Corsewell Lighthouse. Was inspired to visit this area from the ferry to Northern Ireland.
In the past in regards to Scotland, I have stayed in Ayr, and near Oban a good few years back. I have visited Edinburgh with a friend.

As mentioned I have been to Northern Ireland, but tend to visit County Fermanagh as there a lot of gems IMHO ie, Drummoney Falls, Cliffs of Maghos viewpoint, Lough Navar, the Loughs near Kesh. Also stopping for a walk near Lough Neagh. I have visited Giants Causeway but I think I would have preferred to visit before visitor's centre.

Not seen much of Wales, I have stopped in Prestatyn and near Mold, but that's on route to the ferry port, so was an overnight.

I live now in Co Durham, I used to live in East Sussex (near Kent) so I have visite d the Lakes, Northumberland, down to Scarborough, Whitby etc.

Holidayed in Cornwall a couple of years ago but I PERSONALLY prefer somewhere less busy (I main holiday September) but that is my personal taste.