I've been going to Holwell Hyde occasionally for about a year- I agree it is a dump, but it is close and usually offers plenty of bites for a short evening session.
I was back there recently and the rubbish problem has got pretty bad. Management have changed the rules so that night fishing is now by prior appointment only, and the 'first light to dusk' policy seems to be pretty firmly enforced. Also the bank from the left of the car park is now only for regulars (I'm not 100% sure about this...).
I have no idea if these changes will improve the place. I agree with previous posts about rubbish, bad fish condition, bad attitudes, unsupervised kids etc. Maybe these changes will help... (maybe not!)
Any ideas for different decent runs waters near Welwyn Garden City?