which was news to me as I have been paying PAYE tax all year. When I looked closely at the letter it turns out my employers have given them wrong figures and said that I earned nearly £40,000 last year (I wish!!) - (my earnings are no more than £28,000 tops)
I have phoned my salaries and wages dept and emailed them across the relevant info, but I am bricking it slightly that this will turn into a difficult mess.
HMRC were reasonably helpful, and said employers quite often makes mistakes like these 
Anyone out there with happy stories of a similar problem that was easily resolved?