Here's a UK CAA depression flow chart.
http://www.caa.co.uk/docs/2499/Depre...0FC%20v2.0.pdf
The CAA cannot (
afaik) pull your medical records without your consent so they are unlikely to determine any previous problems on a snoop. You have to sign a consent form if they require medical history from your GP and they're only likely to do that if you raise a flag.
Here's the medical application form.
http://www.caa.co.uk/docs/49/Medical...n%20MED160.pdf
Does it mention depression as being a required declared item? If it does and you tick a box then go to the medical armed with a letter from your GP saying that the depression was ten years ago, that it has never recurred and that you are not on any medical treatment for the ailment.
Good luck.