In 2016 and 2017 I was still being sent paper statements for my mobile phone bill. I don't think I am any more, but do I need to keep the old ones in case I'm investigated by the tax man? I mean I doubt I will be, I just provide childcare on a self-employed basis for pennies, but I don't want to make things more complicated than they would be otherwise if I were! Obviously my bank statements have a record of my monthly phone bill on them anyway. Can I get rid of the phone-related paperwork?