In reply to Mr-Cowdrey:
Regarding your poss Cloggy link-up Pinnacle Arete is not E3 5c but E2 5b. I wonder if you were thinking of the classic combo of Pinnacle Arete and The Hand Traverse (which IS E3 5c). If you did mean Pinnacle Arete one of a number of suitable approach routes might be Serth also E2 5c 5b and a very good climb. Then you could do The Hand Traverse as well, which was our idea but we had a look and bottled it!
Or just do one of the big West Buttress routes (W Butt Eliminate? Bow Right Hand? White Slab?) then you might not feel the need of a link up!
The best link-up I've done in Wales was Suicide Groove & Javelin Blade, (at Idwal), Grey Arete (Glyder Fawr), and Hebenwi (Clogwyn Du). In The Lakes maybe Laugh Not, (White Ghyll), Arcturus & Golden Slipper (Pavey Ark) and Poacher (Gimmer).
But the possibilities, like the answers to your question, are endless!