It was in EH Smith who haven't had any beyond their list of pre-orders since the lock down ended. I asked in there today if they had any yet and he said "Yeah loads, how many do you want?"
I asked when they'd have more in and he said that they're back on their usual supply deliveries. They're selling more at the moment while everyone catches up, but I guess that'll settle down soon enough.
So maybe it's different in other areas, but if Smiths are selling it without issue I'd say Birmingham must be close to normal supply levels.
I imagine there'll be quite a few lock ups and conservatories chock full of paper wrapped 25kg solid blocks over the next couple of months. Mind you, I suppose they could always start cutting it into the Colombian marching powder.