ADSL2+
ADSL2+ is still available. I think all ADSL is now provided using ADSL2+ even if it's limited to 8Mbps. The reason the up to 24Mbps connections dissappeared is that it was only achievable in very specific circumstances. You had to be practically sitting in the exchange to get that speed.
Also marketing, most people can get 40 or 80 on VDSL now so there's no need to try and market your ADSL as 24Mbps anymore because you can offer a faster service on VDSL.
Biting the hand that feeds IT
