By Managerial, I assume you mean where does a manager sit in the hierarchy... In which case, they are directly above consultant. You then have Senior Manager and MD above that.
£55k is a good salary for a consultant and would suggest they are bringing you in towards the top of the band.
You'll probably want to be aiming for Manager within a couple of years, the starting salary is 66k (I think), plus you receive a car allowance of around 6k.
This forum has tons of info on ACN career levels/salary, do a little digging.