Nen,
On the mot test certificate, the name is the name of the MOT examiner not the owner. Also there will be an MOT test number. If you have this you might also find out if the car is currently MOT'd here...
http://motinfo.direct.gov.uk/internet/jsp/ECSID-Internet-Status-Request.jsp

it's an old certificate so it might not work. If it does, it will tell you which test station the car was MOT'd at. The test center might have the name of the owner if they pre-booked it for a mot.

john