Thanks everyone for your warm welcomes.
Hi Ole, hmm the only room I have that is vaguely suitable for a darkroom is very poorly ventilated. I've heard that developing chemicals can wreak havoc on sensitive lungs and so I thought I'd better get my extractor fan working properly before I indulge in any experimentation! Hope this makes sense. I don't know the first thing about developing, but thought I might get into it because I'm tired of shelling out 10 quid at the pro lab just for processing BW negs.