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Although this is not to do with full size steam or model engineering I have a little story of how easy it is for historic and iconic items to be scrapped when no longer considered of value. – Bit of a story but please bare with me.
A few years ago I was bringing a yacht back from Spain for someone. Before the bay of Biscay was crossed we pulled into La Coruna in northern Spain before striking out for the Scilly isles.
By chance we ended up moored next to an English chap and his wife. We got chatting over beers and it turned out he was as Ex British airways captain who had started his flying career working for 'Betty Windsor' in the 60's flying amongst other things Hawker Hunters. – I have always liked the lines of the Hunter and we started talking about aircraft of yesteryear. Obviously with me doing far more listening that talking. – Really nice guy and an interesting chap.
Anyway. He was telling me that the squadron had been overseas (think it had been south Africa) and when it came time to return they came back in hops. The last being in Germany. Here they were told that upon getting back to the U.K. they were to give a firepower demonstration upon a ground target as there would be dignitaries there to see it. They were told what the target(s) was and obviously the location, armed up and departed with much enthusiasm as there is nothing that fighter jocks love more than blowing things to pieces.
Upon arrival there were the targets where they should be and they proceeded to do as ordered and with much joy and euphoria rendered everything into tiny pieces with flames and explosions. He told me they all had a great time and upon landing there was much grinning, back slapping, beer drinking into the night and questioning why they were not allowed to do such things more often.
However.! ……… He then told me that as years have passed he has had much regret and sadness over what they did and as each year passes that regret increases. – The 'target' had been 6 parked Spitfires. 
Nick