Hi,
I am the owner of a small fleet of Transits, and always preferred to lease them rather than to buy. In fact, I preferred to lease when I first started my business with just one van! It always seemed to make sense to me, as you were getting the best deal possible and the reassurance of knowing that the maintenance was lobbed in as part of the deal. The best thing is the fact that you can return the vehicles after the agreement period and renogotiate a new deal with the latest models or buy it outright.
I would recommend the following dealer based in Leicester for their help:
http://www.mwvc.co.uk