Ratcatcher, the swarm when clumped up was about rugby ball size and shape. When I opened the hive last night to get the branch bits out they had stuck 3 pieces of comb about the size of a side plate and one almost dinner plate size to the roof and had filled some with "honey" I'm guessing. Some cells had "dirt" at the bottom, but nothing was capped.
Until I can find a local mentor to look in the box I can't really tell if this is a second swarm or a third cast, because I wouldn't know what I'm looking at.
I will check again in 3 days to see what they are up to, but all I know so far is that the queen is still in there somewhere, (bum up fanning on the front step to call back the clingons on the outside after I shut the lid), there are at least 2 big drones I've seen, and there were enough workers when I brushed them off the lid to fill up at least the gaps between the first 4 frames and probably a tennis balls worth hanging to the outside of the hive.
It was local honey from a market, but they will only be on sugar syrup from now on.
Thanks everyone for your help, it's nice to find a forum who don't argue all the time and I'm learning loads just rummaging about.