According to Cambs County Council at
http://www.cambridgeshire.gov.uk/CMSWebsite/Apps/News/Details.aspx?ref=401&HighContrast=yes
BT will be upgrading Wansford exchange to provide ADSL2+ "up to 20M" services, no doubt inspired by the arrival of Talk Talk and Sky / Easynet who are already operating those services since mid 2011.
ADSL2+ increases the peak speed one might expect in Wansford itself and maybe out to a 1 mile radius. At the far end of range ADSL2 gives a speed boost of a few hundred kbits/s which may help Wittering and the further reaches of Nassington.
