I have been reading the posts from various sites and would like to pass on this experience.
I have BT infinity and have recently been experiencing slow speeds on wireless (from 5mb - 20mb) although getting 38mb on wired. I have been on with the Bt help desk for weeks to try to sort this out with no result, and have actually been told to expect this as normal! 5mb on infinity...I dont think so. Yesterday I did something simple after reading it somewhere. I unsubscribed from BTFON. 24 hours later I have 37.6 mb on wireless and 38.1 on wired.