Followed road work diversion down a bus lane. pulled for going thro bus lane red light.?

hi. i followed a circle blue sign with white arrow pointing diagonal left upwards. There was a road 80 to 90 degree angle left. so ume the sign would be horizontal for this. there was also a road virtually straight ahead but slightly left. i followed this round believing it to be correct. a car pulled down a side road infront of me. didnt follow it as there were no diversion signs to go that way. my normal procedure is to follow straight ahead until next diversion sign. just after this side road was a red light sign next to it read, Light changes green for buses only. I went through as i was still following the diversion. a police woman pulled me told me i was driving in a bus lane. asked me to park up on double yellow lines near a lowered pavement area for people to cross. i was wondering if this procedure is normal? do 2 wrongs from following a road diversion and police officer instructions make a right? this happened in wakefield i am from leeds. Who should i contact to inform them i believe this is wrong? is it council, government, newspapers? Or the road work company, Does anyone know the road work company sending people down a bus lane in wakefield? any help and opinions would be good. email - mnewman@tycoint.com thanks.