There is a live FLARM tracker on the Open Glider Network web page. You will need to view it via a separate window: http://live.glidernet.org/#c=51.79193,-0.74435&z=12&m=r&s=1&l=zr&w=0&p=3&u=i&n=0 

The vast majority of RAF Halton aircraft carry FLARM devices so they can be seen on aircraft FLARM devices, the Open Glider Network (OGN - see link above and below) or if registered on Flight Radar 24. Visitors to RAF Halton airfield are strongly advised to carry a FLARM. Further details on FLARM equipment is available on their website: http://flarm.com/

The Open Glider Network is a free tracking system for FLARM equipped aircraft and provides situational awareness only of aircraft that are being tracked. More information is available from their web-pages at: http://wiki.glidernet.org/

Flight Radar 24 (FR24) provides a picture of local traffic using ADS-B, some registered FLARM and some Mode-S. More information is available from https://www.flightradar24.com/ the map below shows a small area covered by FR24.