I'm not aware of anyone in the UK that actually has stock but there are plenty of units coming from ASUS, TP-Link, Linksys, Zyxel and the Netgear you mentioned. Send OcUK customer services an e-mail asking when stock will land. If they're on a ship en route they should be able to give you a delivery estimate.
From the stuff I've seen in testing that I can't name I wouldn't get your hopes up for anything 6GHz very far outside the room the access point is broadcasting from. The ability of 6GHz to penetrate walls and windows seems to be massively less than the 5GHz signal from an equivalent WiFi6 access point. If you live in a barn conversion, loft or open-plan house then you might see a benefit but on the one client device I have I get about 2Gbps over the WiFi6E link in the room and it drops to WiFi6 at about 900Mbps as soon as the client is outside of the room. And that that's before you start asking sensible questions about what kind of wireless devices can exploit large file transfers or data streams in excess of 1Gbps that wouldn't be better cabled to give 2.5, 5 or 10Gbps data rates completely reliably.