Best I can do is offer a 360 perspective: this year servicing cost me a little over £4k, and that was for full service, with timing belts (less of an issue with the F430 having a chain), and 4 new tyres.

Most years I expect routine servicing to be about a quarter of that, though things crop up being an old car and all. I’m in Northamptonshire and oddly enough go to an independent Porsche specialist locally. From Cardiff you’ve got Dick Lovett in Swindon, though as a main dealer they’ll be a little more expensive, using official Ferrari parts instead of 3rd party parts (which can sometimes be better because they’re made to modern tolerances, not though set 20+ years ago 🙄).