Please confine Air Cadet comments to the relevant thread, chaps/chapesses/chapthings...
RETRO TRACK & AIR (U.K.) Ltd would seem to be the company responsible for the overhaul of BBMF Merlins.
I also found this 'official' BBMF statement:
A routine inspection has highlighted a fault with one of the Merlin engines in a Hurricane aircraft. We are currently investigating the fault and as a precaution, flying of Merlin engine powered aircraft has been paused. We are still operating Griffon & Gypsy powered aircraft, including Spitfires and Chipmunks. We realise the disappointment this will be to our many supporters, however safety remains our paramount concern
One of the
engines in a Hurricane....