How can I avoid penalty for late tax return year ended 5 April 2010?

We've got them on the run.

http://www.accountingweb.co.uk/article/tribunal-sl...

Well it's me you're going to appeal to. If I don't believe you then I'll slap on interest and penalties. Why not admit it, pay the £100, and get on with your life rather than waste my time writing letters back and forth?

you can't they will fine you £100 for late return and keep fining you till you send it in

call them and speak to them they don't bite

simples

Well . . you could say you sent it in already . . . and don't know why your check wasn't cashed, and didn't realize it . . they might let you off, as it's out of your hands when it is delivered to the post office, (which the government owns by the way) . . worth a try

In the UK they will not accept any reason apart from death. Contact them, the fine will be getting bigger.

Sorry - you'd need a good reason, and it needs to be provable. You've no chance.