Don't worry about this; I had a review meeting with the guys at the CAA on the same subject sometime ago. Basically it's just a chat to check your history and understand the causes behind the previous illness and how you are now. If you have been off the tables for 2 years or over, it sounds like you are OK.
As I have pointed out before 1 in every 4 people will become ill from a mental illness during their life with the most common being depression or anxiety. Pilots are no more immune to this than anyone sector of the public.
There is no hidden agenda to catch you out; it is just a review (chat), which the doc will make recommendations from. At the end of the day they are trying to keep you flying and not to stop you unless you are unsafe.
The CAA have long reconiged the issue of pilots taking SSRI drugs and the hidden problem of pilots not declairing their illness. There are changes afoot but you will need to keep an eye on the CAA medical web site for future announcements on the subject.
good luck