[Scotsdumpy]

This might seem like a daft question but how do I know if someone has claimed single farm payments on my land?

[HappyHippy]

If you're in Scotland, get in touch with your local SGRPID office (or DEFRA in ENgland & Wales) I think they should be able to tell you.
Here's a link to the Scottish offices http://www.scotland.gov.uk/Topics/farmingrural/Agriculture/AOcontacts/contacts
HTH
Karen 

[Small Farmer]

In England it's the Rural Payments Agency http://rpa.defra.gov.uk/rpa/index.nsf/vDocView/FFFDD11D4803F7D580256F72003DD33D?OpenDocument

[FiB]

And Welsh Assembly have an arm too - I went to our local office in Dolgellau and they checked for me.