Gomer
You have to remember that you are lucky, you have WAAS in the USA (WAAS being wide area augmentation system, ie a geostationary satellite transmitting differential gps data). With WAAS and a tso 145/6 gps receiver the accuracy and integrity of the data is several orders of magnitude better than without. Here in Europe we still have no WAAS satellite - EGNOS is still under development and only radiating for test purposes. Hopefully it wil be on stream soon and then all we will need to do is to upgrade our equipment to tso145/6 to be able to fly LPV approaches. There is no way you should be flying LPV approaches with tso 129 gps / no WAAS.
There is a GPS NPA published for Inverness (down the road from Aberdeen). Of course it has NPA minima so on some days the ILS is a better bet, but on some days when the weather is not too bad and the radar is off, it offers a more expeditious approach than the full ILS procedure.
HC