You have the right to complain about an MoT if it has passed and you think it should have failed, but unfortunately the time limit for this is 28 days after the date of the MoT.

You can still contact the DVSA if you wish to complain about the service you received, you can find the contact information here: www.gov.uk/getting-an-mot/problems-with-your-test-...t

It is important to remember that the MoT test is designed to ensure that the vehicle is road legal and meets minimum road safety requirements on the day it is tested, rather than diagnose any faults. It is possible that at the time, the leak had not developed sufficiently to be spotted by the MoT tester.