Red Lion are still listed on the Eriba website and there's no mention of United British.
The weird one on the Eriba dealer list is the Spinney Group head office site at Holmes Chapel. It shows up in a search for caravan dealers but is only listed as a caravan service workshop. It's odd because the Holmes Chapel site is mostly motorhomes because that's what Spinney started out as, a motorhome dealership. But they've not taken on the Eriba campervan option according to the Eriba site listing. And if you look at the Spinney Group website there's no mention of Eriba anywhere.