On the other side of the coin....You may as well get an FAA PPL ! The costs to maintain are significantly cheaper, ie. Licence is free, a BFR every two years which can be done in the UK with an FAA instructor, and gives you the same freedom as a NPPL in a UK reg aircraft. If you fly an N reg A/C, you can fly at night without a NR, fly abroard if you fancy a trip to LFAT and don't need an RT licence. Medical requirements are far less stringent, and can easily be gained in the UK. PLus the medical is valid longer than the almighty JAA class 2...Oh and training costs in America are far less, $80 / hr including instructor in a C152......
So as you see there are plenty of options. In your situation if you are 100% sure you do not want to fly around abroard, or in IMC, then the NPPL is probably right for you.
Cheers
EA