I found it by accident, Katy, the info you wanted:
You need to get your postcode linked to a grid-reference first from streetmap, then type in your grid-reference (at 4 digit resolution) (which you can get off an OS map, otherwise) to
\link{http://www.bwea.com/noabl/index.html\Wind energy website.}, \link{http://www.dti.gov.uk/renewables/technologies/windspeed/online.html\dti website}.