I am buying my van on HP but I am leasing my TM. When I investigated the monthly payment rates for each item, I found there was hardly, if any difference between lease and purchase.
However, tax wise, you can of course claim capital allowances straight away on purchases, whereas with leasing you can only claim against the monthly instalments as expenses.
Some say one is better than the other, Im not sure, at the end of the day if theres much difference.
I believe that when leasing a van you have to pay all the vat up front, and obviously if you are not registered you cannot claim it back, with a machine, when you lease you pay vat on each monthly payment.
Dave.