I can't tell you whose it is but its reg is OO 7770 ( the first two being letters and the rest numbers).
From the DVLA website it is, indeed, an Aston Martin.
The vehicle details for OO 7770 are:
Date of Liability 01 05 2012
Date of First Registration 30 04 2008
Year of Manufacture 2008
Cylinder Capacity (cc) 5935CC
CO2 Emissions 394g/Km
Fuel Type Petrol
Export Marker Not Applicable
Vehicle Status Licence Not Due
Vehicle Colour SILVER
Vehicle Type Approval M1
Vehicle Excise Duty Rate for vehicle
6 Months Rate £253.00
12 Months Rate £460.00