HMRC send out P11D(b) penalties in error

HMRC have just issued the following message:

A very small number of employers have incorrectly been sent an interim penalty warning letter for failing to submit a P11D(b) when they have, in fact, submitted their return  for 2013/14.  Most of the letters that have been issued inappropriately relate to employers who have changed their trading name recently.  If you or your client has received a warning letter and you have successfully filed your P11D(b), you do not need to take any further action. We apologise for the inconvenience caused and are taking urgent steps to rectify the situation. All of the records impacted by this issue will be updated and a penalty will not be charged.