Hopefully this answers a few questions, as these have been my costs over the 4 years I have had this car.
Warranty
https://www.porsche.com/uk/approvedused/porscheapproved/warranty/
Warranty Costs
£660 / £1190 for a car that's in Warranty + 111 Point Check
£740 / £1270 for a car that's in Warranty + 111 Point Check + 90 wait to put the car onto a warranty
111 Point Check - £216.00
Porsche Assistance cost for 2 years is £275.00 (Breakdown Cover + Replacement Car)
Service Costs - Every 2 Years / 20,000 Mile, which every comes sooner
2 Year - Minor
Total Cost £579.98 (That includes the break fluid change, that's every 2 years.)
4 Year - Major
My Current Quote is 1050 / 1100 ~ (That's Service, Bits needed, MOT) - I'll update this when I collect the car at the weekend.
Tyres
Michelin Pilot Sports 4 S £183.54+VAT (Front) / 244.35+VAT (Rear) - That's a OPC supply and fit.
Miscellaneous Items
Replacement Windscreen £808.49
Oil Change £238.68 (I can't remember if I supplied my own oil on this one or not)