Reading the Sun's article, it appears to me that it may have been a Konsin-type anti-freeze that was put in the fuel, rather than engine anti-freeze - it's still a monumental cock-up on an epic scale. I wouldn't have thought that the contaminated fuel would be useful for any ground use, let alone being offered to the bennies. It's a long time since I was at MPA, but ISTR that Konsin was kept in a totally different area to where the FSII was stored, it certainly was no where near any aviation fuel installations. Perhaps THS's knowledge is more up-to-date than mine.