Just submitted my tax return online which was pretty painless and quick. On the final page, I entered some additional information with a minor query. When I submitted the form, there was a data validation error. When I read the error message more carefully, I realised that the carriage return character is not allowed in the free form text box so I removed all of them. However, the form was still rejected until I realised that the question mark character ‘?’ is also not permitted.

So, rather like Tom Kyte, the Inland Revenue is not currently accepting questions.