This has nothing to do with "making your broadband faster". This is about increasing the speed of pre-existing links by upgrading the bits at the end, so they get network upgrades without having to actually upgrade (much of) the physical network.
The point is to ease congestion on POPs/exchanges that have reached capacity and yet have no commercial incentive to upgrade. Its not to make your ADSL go fast in a little village somewhere.
Plus, if you ever did want your little village to have fast internet, then the backbone within the UK would have to be much much faster. Hence working on things like this, rather than trying to lay 50x as much fibre on trunk links.