Make them feel the pain
All MPs and BT employees above say "team leader" grade should have their broadband service at home and work restricted to the bandwidth and level of service of the lowest performing customer. Costs almost nothing to do.
BT "management" should have all business calls prefixed by a useless 10 layer menu system which if successfully navigated leads to 25 minutes on hold with a broken muzak player before a one in three chance of a random disconnect. Might be trickier to implement but I'm sure there'd be volunteers to build the system.