Here are a few of the topics covered on our http://www.poole-motorcycles.net/mot.php page.
Lights and Horn
Check that the lights work in all switch positions, that the lenses are not cracked and that the headlight beam height is correct. Also check that the turn signals function correctly and flash at the correct rate and that the horn is loud enough.
Exhaust
Check that the exhaust system is mounted correctly and securely. When the engine revs are increased check that the exhaust gases do not leak from any part of the system and that the exhaust noise is not excessively loud. The exhaust system, particularly the end can, must be UK legal.