Claiming, seller, stakes, handicap, group 1, group 2, and group 3. I'm not sure if there may be more types of races. Can anyone tell me in what order of importance/class all types of races are held, please?

I am a stickler for things of this nature and would like to play the game as near to real life as possible. I have spent an hour or so searching through the British Horse racings rules but didn't find anything that would help. What I am looking for must be somewhere. Also, the same for jumping races, please.

Further to the above. I did one last seach and EUREKA!!! If anyone else is as sad as myself, I found the information on something called 'Flatstats' or type in 'types of horse racing'.