SJS Cycles?

Was fine for me yesterday

Worked for me OK yesterday while I was dithering over some expensive wheel components that will cost more than the bike they are, (inevitably) going on.

Clear your browser cache and you should be fine

That's odd. Chrome on an android phone (Moto G84), all updated, cookies cleared, no problems with any other websites that I'm aware of.

All good here.

Clear your cache? Open in incognito?

Clear your browser cache and you should be fine

I clear the cache regularly with AVG Cleaner, but just did it directly - still not working.

Open in incognito?

Yes, that worked. Wonder why?

I just bought some tyres from sjs, arrived next day. Didn't like the 7 quid postage but they were still far cheaper than anyone else.  Given the choice I buy from sjs or spa.

I had the same thing a couple of days ago, only on chrome on my mobile. Brave worked fine as did the laptop, so I was able to order the bits I need.

Good shop, used them quite a bit as they carry a lot of touring parts

Yes, me too. I've dropped them a heads up in case they're not aware of it.

Same error for me on Chrome, no other sites affected. Works in Edge and Chrome incognito window, strange.