Well with 50k miles now showing on the GTI, I decided to treat it to a big service - can't believe what a difference it has made to the car, it was obviously in need of some TLC!
Completed today:
Oil and filter (Castol Edge 5W/30)
Fuel filter
Air Filter
Spark Plugs
Pollen Filter
Discs and pads front and rear
Coil pack x 1 (old one looked a bit suspect)
New bonnet catch & sensor (old one had broken)
Biggest difference is the brakes. The discs that came off were in a right state and had fallen away terribly on the inside edges. With the new ones fitted and bedded in, the difference in braking performance and pedal feel is night and day.
Replaced one of the coil packs because we noticed on the last service that it was all rusty/corroded on the end. The was running fine but it did seem to be struggling to start in the morning - not sure if this was the reason though!
Needless to say, the car is like new now!