Annexe M is normally a chargeable extra - the only ISP I have seen supporting it is BE. O2 use the same network and do not!
On ADSL2+ without annexe M you should still get well over 1Mb/s upload, unless TT cap it in the same way the SKY do!
Ex <n>ildram , been to SKY MAX - 15,225 Download
BE Unlimited - 21,000 Download 1,200 Upload,
Moved house, now BE Unlimited 6,500 Down, 1Mb/s up - gutted!
FTTC Cab installation commenced 12th April - expect full 80 / 20 - bye bye BE, hello BT Infinity soon!