afaik theres only been Plusnet and Zen who have categorically stated that they use Speed. Its likely that AAISP also use Speed.
Ive seen mention on BT's forums that if you pester they will check & change you to Speed. Re TT, Ive heard that if you have TT TV then you will get placed on the higher profile. How true or not either of those rumours are I dont know. Default profile is supposed to be Standard unless the ISP opts otherwise.