Apologies for the late reply, and for the confusion caused.
The Box is installed on an old netbook that I keep at Work; as my Office Window looks out onto LHR Arrivals and Departures, plus most overflights, its sole purpose is to alert me to what's around the local skies there. As I said, most would consider that a waste, but it suits my purpose fine.
I'm not very good with matters technical, so I guess what I 'should' have asked was if I'm OK to just plod along as I am ? - or will there come a time when I will have to upgrade ?
Apologies again and thanks for your support (and patience!)
Dave