I do not wish to get controversial, and it was a long time ago, but my memories of the Vulcan are as follows:-
The canopy had to go before a seat could operate.
There was a handle outboard of each pilot which could be used to jettison the canopy - for instance on the ground if the undercarriage had folded and the only way out was through the top.
The primary ejection handle was on the front of the seat pan - in my case there was in fact no room to operate the face blind handle between my helmet and the roof!
The canopy pin was large and agricultural. Nav Radar would make the canopy safe, then make the seats live, then make the canopy live. Reverse process after landing.
The pin from the sear on top of the gun would prevent the canopy wire withdrwaing the sear. IIRC there was a built in delay (half sec?) to make sure the canopy was clear before the seat gun fired.
Seat pins were stowed in a visible rack outboard of each pilot.
My rear crew never asked me for any extra abandonment training!