Hi Flyer,
You don't mention what sort of AOC operation that you want to have, and this will make all the difference. I don't think that the CAA will specify a single minimum because what they look for would depend upon what sort of operations you want to do. Fairly obviously, you might expect the CAA to want the CP to have experience in excess of that required to be a commander for those flight types!
Other replies have also mentioned that you need to be able to show that you have the skills to do what a CP does most - move paper around efficiently
It also will help if you are known to the CAA FOIs and are reasonably well regarded with no flying skeletons.
To get an AOC under JAR-OPS you need a minimum of 2 people to be approved (excluding maintenance stuff). Normally, these would equate to the CP and the Ops Manager or similar. If one of these had certain weaknesses, say in terms of experience, I think it is reasonable for them to look at the other person's qualities as well.
The short answer though is ask them....