John, and Sylvia,
Nice to hear from you on the site again, ('long time no speak'), so to save you the 'worry', John is to be found here
http://www.jchcaravans.co.uk/.
A very 'vibrant' looking site John, well done!
There is another place to advertize your Hobby and that is at
http://www.germancaravans.co.uk/ but I can understand your possible reticence!!! I don't think you have to buy from them to sell a 'van there though.
I think frampton's idea of renting a motorhome, to ty it out, is a good idea.
Joeressen's rental rates are very good, and if you decide to buy after the rental, the rental charge is 'lost'!! At least that was the case a couple of years ago. I'm sure F-J would cut you a deal.
Problem with motorhomes is that you have to pay the UK VAT, re-coup or not pay German VAT and then get it registered in UK with the DVLA which involves letters of conformity etc etc.
Perfectly possible as many have done it, but if you buy s/h I'm pretty sure that you just pay the German VAT already included in the s/h price and then you only need to register it with the DVLA. As German VAT is lower, a nice s/h motorhome from Germany with all the TUV testing etc. would be very appealing!!
I do have a possible contact/route for buying Hymers at the end of their season at greatly discounted prices, or so I'm told, but I've not actually investigated the viability of this option; . . . . . yet!
Happy Hobbying, in a 'van or motorhome, or whatever!