Hammy said:
The Cambrian CC topo is fully on P bolts unless any have been removed recently!
Pwll Dwfn is definitely all on P-bolts now. It was originally only partly p-bolted, but was done fully some years back.
As for OFD, Pendulum Passage is a good bet (3 pitches with good bolts). This can be done as an exchange with the Nave (2 pitches, look around for naturals on the first), or the two could be done as separate entities.
There are two more really good training pitches between Ted's Shortcut and Shatter Pillar (don't know the name of the passage they're in unfortunately). They are brilliantly positioned opposite each other with very easy connections between each at top and bottom, and a non-pitch route between the top and bottom too. They are extremely well botled with spits ... one (the longer one on the left) has a very easy pitch head and a free hang. The other (on the right) is shorter, has a more interesting pitch head and a rebelay (I think) can be manufactured half way down too.
There's another pitch down to the stremway at the end of Swamp Creek, which I've never done but has good spits, as far as I have seen.