Dear Sir/Madam,
Thank you most kindly for the offer of the interview.
I regret that at the moment I am unable to attend, due to personal circumstances.
If you are able to hold the position for about a year, it would be very much appreciated.
There is also some new paperwork to add to my references that I have, by law, to declare. Please find it attached. I hope that it doesn't count against my application.
Yours sincerely,
A.Muppet.
Biting the hand that feeds IT
