Aston Martin Vantage V8 service in Sharjah – dealer vs independent?

I’ve had my 2015 Vantage for about a year now and absolutely love the sound of that 4.7L V8, but the dealer in Dubai quoted me nearly 12k AED for the annual service including spark plugs, oil, and a transmission fluid change which just feels insane for what’s essentially a fancy Ford engine at the end of the day. A friend suggested looking into the Professional Aston Martin Repair Sharjah because apparently they specialize in British cars and have the correct diagnostic tools for the older V8s without charging exotic car premiums. I’m trying to weigh the pros and cons because on one hand I want to keep the service history clean for resale, but on the other hand 12k is almost 10% of what I paid for the car. Has anyone here actually used an independent shop for major Aston work like clutch replacement or coil packs? I’m particularly worried about the rear main seal which I know can leak on these engines, and I’d hate to have some place mess it up. Would love to hear real experiences from Sharjah or Ajman owners before I decide.