There is a clicking noise when I try to start my mountfield 1228H MOWER ?

The clicking you hear will very probably be the sound of the starter solenoid operating - a sound you do not usually hear because the engine is turning over.

For some reason the starter is not working - the most likely cause a flat battery - enough power to operate the solenoid but not enough to make the starter turn the engine over.

There may be other reasons but you should first suspect the battery

Get charging...
April 2015