Hello Ceebee,
As you have probably discovered, there are very few official dealers in the UK and stock/choice at the moment is very low.
We fell in love with the T@B at the Birmingham Camping/Caravan show in October this year and decided to do some research. Many of the official dealers in Germany have excellent web sites in which you can search their stocks of new and used vehicles. Obviously a little knowledge of German language helps, but don't give up - any on-line dictionary will help crack obscure vocabulary.
We found a new T@B 400L that had the spec we wanted at a dealer in the North of Germany, made contact via e-mail and the rest was really very straightforward. Collecting in December gave us a chance to test the T@B heating and insulation! Very snug - made better by the thought that we had saved a significant amount compared with UK prices!
Go for it. We are happy to help if you have any questions.
regards