Have not seen any provider push it, the BT Retail 160Meg kludge is the highest yet. Most seem happy to keep it in trial stages for now.
That kludge is interesting, I did wonder about that.
It's actually using a special offer which expires at the end of January. After that the BT Wholesale line rental just for FTTP ignoring WBC bandwidth, etc, will be 33GBP/month + VAT.