I'm ashamed to say that I've not used a UK Youth Hostel for a good 2 decades, but have found them really convenient in Oz, then Belgium/Netherlands/Denmark with DD. She is sensible/old enough to be left in a bedroom in the evening but knowing we are sat reading/drinking in a lounge along a corridor.
In an ideal world there would be one near(ish) a train station AND a beach, with a kitchen for a sneaky break without DH in the summer hols (so I probably need to get my act together and start looking).
Equally I can see that we could make a 5+ day holiday driving out of Somerset and staying at 2+ locations.
DD would love a sandy beach and would be up for trying some activities (body boarding/climbing etc). We would love a couple of NT places and a couple of decent places to eat nearby.
I'm probably over-thinking this, but thank-you for any suggestions.