If I ever leave a slip and envelope for money to be sent, some of the custys (custards) photocopy the slip and send the photocopy back with the cheque. WHY?Its not like they do it every time.
if you are doing more than clerical work at your home address it's then classed as a business premise to some extent , one my custys is a furniture restorer has a workshop in house claims so much as business expenses ie window cleaning