Thank you for your reply on this oven there is not a fan element it has a element on the top which is for grilling and it has an element under the oven base, this oven only gets used for part of the year during the summer as we have an aga but we turn this off during the summer months as the kitchen gets to hot.
It seems that maybe due to lack of use the fan was not rotating as freely as it should and now i have got it going it looks like it might be ok.
Thank you again for your replys and hopefully it will now be ok.
Jason