Someone with more recent experience can probably answer better. But I went a good number of years ago, only because I was driving to Bournemouth and it was ok the way (sort of). It was BUSY and both inspiring and disappointing. Would I go again? Maybe, but probably not at the height of tourist season. Also it's about 100 miles from London, so it will take a good chunk of your day. I think you'd need to be in London for 5 days to a week to justify the day trip. But, that's just me!