"It almost resembled a Garden shed with a very short yet High fixed tail rotor, and a small diameter main rotor I think it had three blades , was powered by what sounded to be a four cylider piston and was getting along nicely at about 50 /60 knots.
It was darkish green or blue (silhouetted) and looked in good nick flying at about 350/450 ft, looked very ancient."
I believe this is what you are looking for VFR pilot.
According to 'Variety', they are now in production of another Thomas the Tank Engine film, this time involving Harold.
Harold was travelling "towards either Blackpool(Egnh) or Liverpool(Eggp)", as this is the area in which the coastal scenes will be filmed.
