In reply to Samuel81:
As others have said, Subluminal is best. While there are possibilities at Cattle Troughs, would not advise you going there. If you get lost along the way (it's happened) and go anywhere else, you'll almost certainly be in a world of trouble.
The Sub stakes are bomber. Still, never go off just one. Always wear a helmet. Be very aware of the presence of other climbers - especially below you. Be warned - the ledges at the bottom may feel sunny and safe - but they can be swept by rogue waves. If you go into the sea at this time of the year, it's over.
If you meet people at the top and they suggest climbing with you, you'll need to make a value judgement as to how competent they are. Tricky.
Alternative suggestion. Go to Portland and climb with others in a much safer environment. There's a Facebook Dorset Climbers group. There's also a group loosely based around a climbing wall in Weymouth - the Aloft. You don't need to have visited the wall to be in the group. Although it's closed, in practice, anyone can ask to get on and they'll be put on. If you get on that, you'll find people who'll sort you out. I would - but I'm in Spain.
If you haven't done much lead climbing, I'm guessing these are relatively early days for you. Early days are by far the most dangerous. Best to hook up with folk who really know what they're doing, take it steady and learn from them.
Good luck!
Mick