I think you have to be VAT registered, but not sure.
I like the unlimited mileage. I would guess there is a limit
No you don't need to be VAT registered. Its just that if you are you can claim all the VAT back on your monthly payments.
Finance Lease means that you take the risk on the residual at the end of the contract. So they don't care what you do to the van as you have to settle any shortfall from your own pocket. A high mileage van is worth less than a low mileage van of the same age.
The £152 per month will be plus VAT. It sounds too good to be true, so there will be a big deposit up front and a residual payment at the end. ( £152 x 60 = £9120 and a long way short of the £14495.00 buy amount.) The higher the mileage the lower the value - you pay.
.