For anyone interested, the flight split up because of illness/other commitments/loss of license and people moving abroad etc. This is what happened to the aircraft;

Auster I – Henstridge
Auster III – Eggesford (this is G-AREI, marked as MT438)
Auster V – sold, possible abroad
Auster VI – not sure, owned by Edward Tait
Auster 9 – Eggesford, sadly the owner died