Thanks chaps, taken on board. It seems there's quite a divide with the Lee equipment. I'll way it all up but may end up splashing out that little bit more and going for the slightly more expensive gear - who knows, we'll see. I think to wet my appetite I'll buy a reloading manual before I purchase anything to swat up and see exactly what is involved.
With regards to the outbuilding, I'll keep a close eye on things to see if any damp creeps in. It's not going to be heated 24/7 like a house so perhaps I'll need to make sure all my gear is disassembled and stored in boxes. Hopefully not as it would be a bit of a faff.
Here's a picture of the building: