Failed the MOT :(

[unfazed]

Over filled and/or wrong weight oil sounds the favorites to me....
Whale

:thumbup
However it is also possible the forks are very slightly bent and if the mechanic who fitted the seals, did not put the forks back in exactly the same position which they were in prior to removal  it could cause the problem you describe.
It is very easy to check by removing and refitting the front wheel. If you have to pull the fork legs apart to get the wheel on, or the space is wider than two mm when the wheel is in position, or you have difficult lining up the holes for the axel then it is most likely the forks are off.
Best thing then is to remove them and roll the tubes (stanchions) section on a flat surface to check.

Either way you are going to have to remove them to check them properly for oil or bend