I'm not trying to contradict you but I asked my mum who is a great gardener and she said there ready to plant now, this is the right to time buy and plant them. is she wrong?
She's not wrong, she's just talking about plants in pots, but that's a more expensive format to produce and to ship, but can be sold year-round to ...less organised... retail punters.
Since the trade is traditionally geared to farmers who don't mind waiting for the rhizomes to go dormant in return for a cheaper price (dig 'em up, chuck em in a Jiffy bag, job done), I'd guess 90+% of hops are sold as rhizomes.
What that means is that the rhizomes get even cheaper relative to potted, and in particular you get a much bigger choice of rhizomes.
This year you also have the effects of Brexit on agricultural labour, and of Covid - certainly
the choice of pots from A-plus is looking rather depleted this year.
Looking at some of the other usual suspects,
Essentially are also looking a bit thin, and I heard some talk that
Willingham were giving up altogether, don't know if that's true. But those sites between them will give you an idea of what's available in the UK - probably the most "interesting" things you'll get are the likes of Chinook, Centennial, Bramling Cross and First Gold.