Thanks Engineer Aus,
The A/C is group owned (and im not the owner). I have reported it & the owner is looking for a replacement engine but he tells me it has been checked & is safe. Me being the paranoid type (and an Engineer albeit of the semiconductor electronics variety!) thought I'd do some research of my own.
If anyone comes across a halflife or replacement O-200 in the UK on their travels, please let me know!
Cheers
Steve