Are you sure it will show flights in your area? Several similar sites only track aircraft in the USA and high level traffic over Newcastle (which I believe is where you live) might be going to Canada as well as the USA. I'd be very surprised it floweb would provide info on traffic to your loocal airport, but I could be wrong!
Have you tried
www.openatc.com? It's quite interesting but mainly shows flight number rather than registrations...