[AdzXC]

Thanks for the replies all.

It goes in for an inspection next Monday so hopefully I'll get some answers.

I did notice over weekend that I seem to have an issue with my Parking brake - its non existent when the car is hot but also creates a lot of squeal noise when released. Could my parking brake be creating drag on the engine? Would kind of make sense to me... would explain why I'm getting an intermittent jolt before the car starts moving after letting off the brakes and engine noise gets worst when at full temperature.