Ordered a RadarBox Flightstick. Just a few days for delivery. Comes in a very BIG box so will not fit through a UK letter box.
Initial impression is that it certainly more sensitive than an older RTL-SDR dongle. No time to do a direct comparison but for $9-95 plus $4-99 postage seems worth trying (=£12-04). Does run hot so maybe will not last long.