According to the article "The SUWS WebSDR is located at Farnham not far from London, 51.3 N 1.15 W" I believe the grid square is IO91.

EMike On Sun, Aug 17, 2014 at 12:56 PM, Dave Marthouse dmarthouse@gmail.com wrote:

What's the grid square for the SDR in the UK that was mentioned in this week's ANS news? I think it's at the university of South Hampton.

E. Michael McCardel, KC8YLD V.P. for Educational Relations, AMSAT-NA