This solar-powered pico-balloon was tracked passing the Faroes on Thursday afternoon, with a trajectory heading toward the UK:
It's currently transmitting APRS on 144.8, but lacking GPS fix:
However once it gets a fix, it will switch to 433.500 (whilst over UK airspace), but using its 2m antenna on the 3rd harmonic. A few of us heard it on this frequency during its previous pass a fortnight ago, but the modulation sounded a little distorted and only one station (G4NOY) managed to get any decodes.