you won't pull out unless you twist your foot or have the tension too low (or you have unpredictable old second hand spd-r with a loose tension screw..ahem)
those MKS things look like the solution for JKA riders and some US match sprinters. all very far removed from your first season at Herne Hill
if/once you become regular at the track, you may start to favour another system, but don't forget having straps and a release system like those mks things means you have to stop on the fence, or roll on the grass, ride slowly,or trackstand and be able to undo them and get a foot out before you fall off. (or you need a catcher) Not always easy at the end of a hard race, and stopping on the fence in the middle of an exercise/race isn;t usually an option either.
Far better to add a strap to your spd-sl or look pedals as a failsafe later on anyway
start with looks or spd-sl
you won't pull out unless you twist your foot or have the tension too low (or you have unpredictable old second hand spd-r with a loose tension screw..ahem)
those MKS things look like the solution for JKA riders and some US match sprinters. all very far removed from your first season at Herne Hill
if/once you become regular at the track, you may start to favour another system, but don't forget having straps and a release system like those mks things means you have to stop on the fence, or roll on the grass, ride slowly,or trackstand and be able to undo them and get a foot out before you fall off. (or you need a catcher) Not always easy at the end of a hard race, and stopping on the fence in the middle of an exercise/race isn;t usually an option either.
Far better to add a strap to your spd-sl or look pedals as a failsafe later on anyway