Thanks Paul

I'd normally crank the aperature number up to F13+ for the prop aircraft however the purpose of my trip to BHD on Friday morning was to test out why the autofocus wasn't focusing properly on my Canon 100-400mm. I was trying to determine whether it was a lens or camera body fault so I wasn't too bothered about catching aircraft, just testing the lens.
Turns out that the lens, which was delivered new at the end of June, has a problematic autofocus. I only got around to trying the lens for the first time last week due to the bad weather over the past month so I missed the 14 day deadline to return the lens to the shop. Now it has to be sent off for a warrenty repair, leaving me with no 100-400mm for my Amsterdam trip next week.
From the above photos, G-FLBA, G-EZAY and G-JECE were all caught with manual focus, and all I can say is never again!!!