I ended up with this image accidently - but looking at it I was hopeful that it may have accidently panned on the movement of the helicopte??
If so, this is a first ever for me!!! (even if accidental...) :) )
@helstor365 Thanks so much Helge - I've tried this a couple of times - with absolutely no success. So this was very exciting. Now that I know what ISO worked here I'm going to have another go - on purpose! :) Thanks again for your interest and encouragement. :)