According to a wholesaler I know demand has risen massively (ok not news) they're shifting more stock than ever. There are some availability issues often with some uk repackagers not being able to repack fast enough to cope withndemand. however this is exasperated for the likes of
CRC wiggle and the big resellers due to the grey import market route they use.
If you are struggling for schwalbe tyres, let me know what you want and I can ask. More than happy to send on at cost + p&p