Is this a maintained lease?
The servicing costs will be similar, as even though it doesn't need the (expensive for what they are) inspections to meet warranty requirements, the lease company will likely require them under terms of the lease. So budget £40pcm
It's also worth bearing in mind you will be outside the "bumper to bumper" warranty in 3.5 years on a mileage basis and still have 18 months to go. If something goes wrong outside the drive train, don't presume it will be cheap

Finally for year 5 you will need to pay for a mobile contract for the car (no idea how much that will cost)
I'm not saying don't do it, but do go in with your eyes open...