Just been looking to get a car service arranged and came across Servicing Stop, they're a company who got backing on BBC Dragons Den. They have a January offer on for the next 3 days that gives you a massive 70% off cost of car service. The offer is nationwide and the company collects your car and drops it back after the work is carried out. I've just booked a full service for an Audi A4 Cabriolet for £75. Seem to have great reviews.
Worth booking now as you don't pay till the service takes place.