Weelll, I knew - 'cos I ordered it!
J could not think of anything and volunteered a new polyhive, after seeing me perusing the BHS site. After ascertaining they were bottom bee space (all my kit is now top bee space) as well as having a larger footprint than a BS hive, she was a little disappointed, but spent the same money (actually less as she was going to get the complete hive) on a further 5 Langstroth polynucs.
Some of these may be converted with the excess space left at the far end (for overwintering fondant?). I was very much less than disappointed, in fact delighted - that over-wintering more standard national deep sized nucs looks to be a doddle, as the two, already in use, in the garden are presently looking very good.
Now, fingers crossed, hoping that my order will be OK and that there are still stocks left in the MBS sale.
Regards, RAB