I think these verses are ok...
The teachers laughed and fell about when I stood up to say,
I'd like to make a better world and be like them one day.
When at 22 wi' nout to do a rich man spoke to me
'with your ugly face and lack of nous tha'd make a good MP'
So I packed my bags, and headed South to old Westminster Hall,
I lounged about, did a lot of nout and got paid for bugger all.
They make sense and there is poetic rhythm.
The other verses either need have words taken out to make the number of syllables fit the line (e.g. 2nd verse has too many words in the second line... take out the "tha's too dim" and it'll ring better)
or they need tweaking to give a bit of logic (as Marc said).. e.g. the pilot one might be linked to a fear of flying. the vet one - an allergy or somthing.
It's ok but it needs a fair amount of work to make it a nice looking and ringing poem The very last line is good though... don't change that one.