Lowdhams is also an official Hymer dealer and, they can service your Eriba and stamp the warranty book, however the one in Huddersfield will only do UK spec Eribas.
I used them last year and they sorted out some electrical warranty work for me with no dramas, I was more than happy with them. My first year service last year was £267 including the water ingress sticker
Ive just took mine there this morning for its second service, if you saw a Familia and Dacia Duster slowing the traffic down on the M62 it was me...
http://www.lowdhams.com/