The maths points to opportunity : with 2 billion more people coming onto the planet in the next 20 years, and 0.5% ‘vintage air minded’, that’s 1 million more consumers ontop of the existing 4 million consumers of live airshow content, a growth story. With the tailend of the WW2 – Cold War bell curve of technical trades reducing competency ratios from one LAME  per 10 Spitfires to one LAME per 1,000 Spitfires, that increases the value of Spitfire competent LAME labour scarcity manyfold, a renumeration growth story. In order to keep excessive LAME renumeration from destroying the viability of airshows, this creates a well renumerated career and training pathway for a 20 year old to learn about repairing constant speed propellers, another growth story. Of course ICE engine lubricants to DTD109 spec need to return to a renewable castor oil base, as they did up to 1930, and lead free SAF to 87-100 Octane needs to be distilled from sewerage fats and renewable pine cone oil, as the Japanese did in 1945 to run high performance aviation engines. So creating specialist SAF suitable for shellac coated cork floats in 100 year old ICE aviation engines that are emissions neutral is another growth story. Just need the old goats to enthuse the young bucks and be patient with them, show them what an oil dipstick is, the right end of a screw driver, the basics. Same way the RAF trained brats in 1935 and Willow Run trained Rosie the Riveter.