Thanks, 'PK, that is an unusual sight then! I did notice a Lithuanian AF C-27 outbound Yeovilton about the same time - it went the other way on Friday, heard it pass over the top, also a German Navy P-3... couldn't see either. ADSB could though!
Don't know that I've ever seen an MI-8 before, they weren't common in Western skies when I was a spotter and I haven't been to RIAT in 20 years.
Cheers
Treadders