We lease one of our cars here in the U.S. It's a Toyota Highlander All Wheel Drive since we live in the country.
At any rate, there are few down sides to leasing with the exception of… mileage limits.
Out lease is 36 months and we're allowed 1,000 miles per month… 36,000 miles total. Thing is, if you exceed the mileage limit, additional mileage is charged at an exorbitant rate… about 25 cents per. We took that into account, since our other vehicles and my trust Ford F-150 four wheel drive pickup are owned. I just wanted Mrs. C. to have a totally reliable, smelling new car.
One can purchase the vehicle at the end of the lease or one can choose to lease again. Rates are usually pretty good. If it's the same in the UK as here, you may find the vehicle you'd really like to lease isn't available. But if you'll be patient, it probably will be in a few months.
The whole lease thing is a factory incentive anyway and in the case of Toyota (and most others I investigated) the lease is held by Toyota rather than a finance company or bank.
We've had no problem keeping within the mileage limit, mostly since any longer trips we take are usually done by flying. I would expect that in the UK, being a much smaller country that shouldn't be a problem.
You still have to insure the car, of course, but the scheduled maintenance is taken care of by the manufacturer.
Word of caution… when you get to the end point of actually intending to sign the lease, the salespeople will want you to purchase all kinds of extras… bug deflectors, dent repair, extra product warranty, etc. It can become attractive to purchase some of the add-ons since the cost is all rolled into the lease. However, you can find that a $300 monthly lease fee can suddenly balloon to $400 (or more).