In domestic installations you should just about always use a type B MCB.
As the circuits are ring mains, they should be 32 amp MCBs.
The difference in MCB types is sensitivity.
On our lighting circuit we have type B, and don't have problems per se, ´though it does trip sometimes if an incandescent bulb blows, which can be a bit annoying. Overall though, I still reccomend type B.
If you use an RCD CU (strongly reccomended), then you ought to have anything outside on the RCD circuit (required), sockets (reccomended). On the non-RCD side you should have your lighting, and debatably the cooker, etc (some prefer them on the RCD side, but some models of oven can cause nuiscence tripping.)