In reply to minus273degrees:
If you want a challenge go and do the Yorkshire 3 Peaks, its one peak after another done in around 10ish hours. You don't get a long rest in a car between peaks, you don't burn loads of fuel, but you can sit in the pub afterwards and be sure you have indeed accomplished something.
Why go to Fort William for a few hours when you could have a long weekend doing loads of stuff and actually enjoy and appreciate the landscape etc etc? Same logic goes for visits to the Lake District and Snowdonia.