Submit the return to avoid penalty increasing any more, ensure complete that stopped self employment in the year so dont get a notice to do a 2013/14 return.
He has had a similar employment/self-employment mix this tax year so he will have to do a return again,
but at least now I am aware of it i can make sure he files it in time and doesn't get more penalties!
For 2014/2015 he will only have employment income so it won't be an issue .... I think!