One little loophole is that all B licence holders have a B+E provisional entitlement. So if you slap an L plate on the front of your tow vehicle and the rear of your trailer then provided you are accompanied by a driver with a B+E licence they have held over 3 years and are aged over 21 (plus any of the other requirements for a supervising driver, can't remember them all!) hen you can pull any trailer, laden or unladen, that you would be able to on a B+E licence (provided you keep to the weight restrictions of the tow vehicle of course). Your insurance needs to include cover for your provisional training though apparently. I think that's all you need though
Tbh though for the £4-500 an intensive course cost it might be worthy just doing one of them
As for a tow vehicle, I'd want the biggest thing I could get
this was part of the reason I bought my Bighorn 
Also, is it just me or are the laws regarding towing ridiculously complicated?? The government websites aren't much use either, each department seems to have its own interpretation
Think I may also go to my local trailer guys and have a chat with them about it. May be better to rent a trailer for the £40 a day, what with the amount I'm gna be doing it 5~6 a year maybe 
if I were renting something I'd be inclined to rent a 3.5 tonne recovery truck. It's more expensive than a trailer, but they're more stable so safer to use. Plus then it means you don't have to have a tow vehicle as your daily - the money you'd save running something small as a daily would probably offset the cost of the recovery truck 
