I saw the same page as the OP this week, just typed yandles into the search bar.
It looks to me like yandles.co.uk is fine if you type it in with the .co.uk bit. Yandles.com - confusingly also a timber merchants but in Florida - may have been compromised and you ended up at the placeholder page but they seem to be up and running normally now. maybe I left the s off, if you go to yandle.com you get an under construction page. Who knows, but the proper yandles is alive and well.
(I wonder, deep in Mr Yandle's family history was there a pilgrim yandle who sailed west, started selling bits of the ship he travelled on for timber supplies and ended up as the finest builders merchants in Ocala, FL?)