Have to disagree about the Ethernet socket. I get 17mbps on TalkTalk's ADSL2+ broadband connected via Ethernet, while it's 11mbps via wifi. If you use the BT Broadband DSL checker, it gives you an idea of what speeds to expect and what exchange you're on. Most in SE22 are served by the Dulwich exchange, but if you're in the DKH area, you're served by the Brixton exchange where DSL speeds can be from 3-6mbps. https://www.dslchecker.bt.com/