Desperate plea for information.

Anyone using self assessment online-beware. I will never use it again.

1.Does anyone know of an action group of aggrieved online filers who have suffered as a result of bugs in hmrc's online submission system?

2.I am being investigated and am being pressured to admit that I was careless in filling in the form! The online system checks for errors and does not let you proceed, so how can I have been careless?  They say if I admit this carelessness, they will then work out the penalties. So what should I do? I do want to be rid of this investigation as I have multiple health issues. At the same time I am not at all sure that I made an error. It is not as if I concealed anything. What if I remain steadfast and not admit any misbehaviour? After all there are two potential culprits here. I am one. Their software is the other. If I did not misbehave, then it is their software that generates the return form is at fault. They have modified their software for 2009/2010 tax year so this error can not happen! How does anyone take on the mighty tax apparatus?

I do not believe I am the first one to be caught and wont be the last. This has come to haunt me 2 years after retirement. If I had been filling the form on paper, it is unlikely I would have made the error. I suggest all online filers pause and think! Is it worth using this system when even if it has bugs in it, they make you responsible for it and hound you into submission.