Flows in the UK often follow the pattern of wait, wait some more, wait a bit again, ah it's started, oh hurry up, oh **** that's my last supers on. It's been a few years but I bet there's more than just Dan and myself here who've harvested good honey from under roofs, ekes used as emergency supers, empty supers put aside waiting for repair pressed back into service with no frames, whatever.
A strong flow is something to behold and hundreds of hives all packing it in at the same time take a lot of keeping on top of, and providing any sort of space is better than hte hives getting plugged out and loosing momentum when the flow we've been waiting for is finally here. Theres only so much extracting to empty supers one can do of an evening.
My crystal ball tells me 2017 might have something in the bag for us so my winter work involves making up many new supers.