Quick question - if I arrive at Gatwick on a BA flight from Glasgow on 1st March (presumably Gatwick South by then?) and am connecting (unprotected connection) onto an Aurigny flight to Guernsey from Gatwick South, do I need to re-clear security or can I proceed directly to the gate?

I am pondering an 11:10 arrival and 11:50 departure which is very tight unless the gates are near each other.