Yup, PX ran it IIRC. Rules were a bit vague, allong the lines of “no TT bars, nothing deeper than open pro rims, normal (vented) helmets, no skinsuits or overshoes, no aero frames or parts, push your luck within the rules and we reserve the right to ban you on the day”.
I’m planning on doing some local club ones on a normal bike just to give me something to aim for fitness wise.
If you wanted to get serious/compettative then maybe suggest a sperate prize for normal bikes at the clubs AGM? Although most roadies I know have a TT bike, even if it’s just an old frame with TT bars and a massively -ve rise stem.