Thanks for the info, this is all new to me.
So I have managed to find the planning decisions. As I thought, from when I bought the house, the development was rejected.
http://plantech.centralbedfordshire.gov.uk/PLANTECH/DCWebPages/acolnetcgi.gov?ACTION=UNWRAP&RIPNAME=Root.PgeResultDetail&TheSystemkey=581876
I have also found the decision for the adjoining property which was allowed a year later.
http://plantech.centralbedfordshire.gov.uk/PLANTECH/DCWebPages/acolnetcgi.gov?ACTION=UNWRAP&RIPNAME=Root.PgeResultDetail&TheSystemkey=586389
Thoughts?