from the gov site, I think yours is not old enough for a visual;
Emissions testing
You can’t get an MOT certificate if your vehicle’s exhaust emissions are too high. Emissions may also be tested as part of a roadside check.
MOT
Most vehicles have their exhaust emissions tested as part of the MOT.
Usually, they’re tested using a meter. Petrol vehicles used before August 1975 and diesel vehicles used before August 1979 are tested by sight.
If your vehicle fails the emission test it fails the MOT. The problem must be fixed before you can get an MOT certificate.
The only vehicles that don’t have an emissions test as part of the MOT are:
vehicles with less than 4 wheels
those with 2-stroke engines
hybrid vehicles
quadricycles