I have been working in Derby for a couple of weeks and have several (12) hand written receipts for a parking space, only including the stamp of the owner of the land (a Ltd. company). One of them does not include the stamp. I also have some cab receipts in this particular form, showing only expense number, date and signature. Will these suffice to show that I have incurred this particular business expense or do I need a more formal receipt/invoice. They were unable to provide me with a more elaborated document as per their own words.
Many thanks in advance.