Checking back through the caterpillar images just recently taken, I was surprised that I overlooked this - the first one I took but rejected because I thought it was too "straight on" but on second inspection tonight, I realised that there was an extra subject in the image. Not 100% in focus on it, as I was concentrating on the caterpillar, but if you consider the size of the central critter, you can appreciate why I hadn't noticed the tiny mite!
Exif:
Camera Maker: Canon
Camera Model: Canon EOS 550D
Lens: 105mm
Image Date: 2011-08-31 18:30:56 +0000
Focal Length: 105mm
Aperture: f/8.0
Exposure Time: 0.017 s (1/60)
ISO equiv: 100
Exposure Bias: none
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
White Balance: Auto
Flash Fired: Yes (Auto, return light detected)
Orientation: Normal
Color Space: sRGB
GPS Coordinate: undefined, undefined
Photographer: Paul Iddon
Copyright: www.pauliddon.co.uk

Paul.