In reply to Stig:
If you search, some while ago there was a thread called Ten HVS's you can't do, which should give you some ideas.
Viper was certainly one, but you said the Peak, so
Masochism, Ramshaw. Literally impossible if you can't jam; decent value even if you can.
Pthlegethoa, Stanage. Unprotected 5c moves above boulders.
Finale, Stanage. Font 7a boulder problem. Possibly easier for non-weaklings.
The Almighty - Blackchurch. A life-changing experience guaranteed.
That's only four, but I think they give a good variety. If you want another one - well, any of Rock & Ice cracks will do fine, or the HVS one of those things called Hardly Hyperkeratosis or some such - fairly ordinary grit E2, but still a little tough at HVS.
jcm