Sounds expensive to me, but then again, dealers usually are. If you're not bothered about owning it after 3 years, take a look at PCH.
I have a GTI, 36 months, 10K / yr, £305 / month, 3 months deposit.
My total payment after 3 years works out at £11,900.
Yours works out at £14,400. We don't know your mileage requirements, so it might not be apples for apples, but it's £2.5K cheaper to lease. Granted, I don't have the option to buy at the end.
Just thought, yours is a 19 plate, so probably a PP. Mine is a standard GTI.