I'm about 6 weeks away from having owned our SC for 12 months now. It has covered about 4200 miles in that time, granted, it's not a lot.

Cost wise, I've spent:

Service & MOT - £320 at Team Valley in Gateshead
Tailgate Seal - £100 from Dan @ Duckworths
Rear Brake Pads - £35 from Advanced Factors
Tyres - £550 for a set of 4 brand new Pirelli P Zero's (Offset by the £475 I sold the Grabbers it had on it for)

Total (excluding Petrol and detailing): £530 for a years trouble free motoring.

It's been a great car and it continues to make me smile when hearing the V8 burble into life.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Bought mine in March 2015 - did 35000kms (21875 miles) since then. Costs thus far 2 services @ GBP500 for both and brakes at GBP150. Not too shabby for a 2.6ton monster. The costs exclude the mods done as it wasn't a necessary expense, but something I wanted done.