Default GPS Tweak

As much as i love my phone i don't love the GPS performance that much.

I've compared with previous phones i've had and my friends iphone and it really lacks gps performance.

It's fine outside in open spaces but in the car or a train it takes a few minutes to lock onto my location.

I seem to remember a few years ago having to use some "tweak" to change the GPS satellite to one favourable to people in the UK.
Does anyone know about it?