Definitely Vortex

Living near Rendlesham you get used to things being swept under the carpet, but yeah this pattern does seem to come up a lot doesn't it.

It moved roughly north to south, made no sound, had what he described as a 'deliberate' movement patternThat deliberate movement is the interesting bit.

The £40 thermal units are absolute rubbish - just picks up your own heat signature mostly. This sounds like a genuine step up. Might grab one for winter investigations.

Worth checking local Bodmin newspapers from that period if you can access microfilm. Libraries often have archives.