Thanks for the comments guys.,
Baz: Sigma 105mm macro, 1/160s @ f11, external flash with off-camera bracket and one of those funky collapsable diffusers. No focus stacking here but it's definitely something I'd like to do next to get more detail. I've even mucked around with reversing an old 50mm Konica Hexanon lens on the end of the Sigma but with the additional weight and magnification, it's unrealistic for hand held shooting. What I'd really like to get next is a
Canon MP-E 65mm macro 