Thanks, thats very reassuring of you guys.
I think you may have hit the nail on the head 'supercharged'.
I took her out on my lunch break today and the first setting did only seem to come on. I then bridged the terminals to check whether the other two settings were working and they most definalty are.
Perhaps its not hot enough for the other settings to kick in? im not used to having such a large engine. usually 100c means problems!
Thanks for your input everone. Youve put a worried girls mind at rest!!!