Here's a few that I've seen out and about that would fit your question:
Jake Quickenden (singer, I'm a Celebrity, X-Factor): Small and uncut with a lot of foreskin
Olly Alexander (singer Years and Years): Normal uncut (serious BO)
Cel Spellman: (actor and Radio 1) Normal uncut
Tom Fletcher (bank Mc Fly): Average uncut slightly longer than average foreskin
Ben Hardy (actor Eastenders and X Men): Normal uncut
Freddie Fox (actor various): Average uncut head peaking out
Calvin Demba (actor Hollyoaks): Medium length uncut, leans to one side
Dean Smith (actor Waterloo Rd): Small and uncut with long foreskin
Robert Lindsay (actor various incl My Family): average uncut but very dark skinned
Matthew Horne: uncut and thick
Greg James (Radio 1): A little one the smaller side, uncut
Iwan Thomas: uncut, a lot of foreskin
Be a little careful believing the comedians, a comedians act is typically fictional.
This website has a list of UK celebs, although it is Australian.