If you look at the screenshot of G-OOMA it was more or less overhead at 12.50 just 10 minutes after contact was lost with G-WAVS.
It appears to be on track for its base at Gloucester then turns 180 degrees and at 12.52 heads back towards Coventry.
Is it safe to assume G-OOMA was at 3700ft VFR on top?
As I understand both aircraft operated by the same school and in the same area at the same time.
Coincidence or what?
The CAA Safety Sense leaflet 23 is worth reading many times during your flying career.