All ISP's have hickups, you have a half hour one and post on multiple forums about it. Give em a chance! I know BT Retails record but I've had Infinity for 14 months now and haven't had a single instance of congestion. What you have seen there isn't the norm and you might hold back in future unless it is happening regularly, then contact BT and report the problem.
IMO they won't start throttleing and traffic shapping, people are too wise to it now. They will just increase backhaul. These days that is the only way to keep customers and demand is only going to go up (even without new customers) so they have no choice.