Hi Shaun
1 or 2 of your fatal errors in your applicaion have already been pointed out, but also to add to that you mention
'team player',
'riders interests',
'bringing problems/ potential hazards to the attention of people in charge',

you also mention you are ' a rider with considerable experience'
you also showed a sense of humour offering to be clerk of the course,
and finally you mentioned ' talking to riders!!!!'
you surely cannot have been seriously expecting to get the job when you sent in such a ludicrous letter did you??? :shock:
Hope things are going well for you back in NZ
Russ