When I first posted this, I very tentatively identified it as a male four spot orb weaver spider (araneus quadratus) (maybe). Or possibly a marbled orb weaver ( araneus marmoreus var. pyramidatus). I hadn’t found the I.D. especially easy, and asked if anyone knew better, for them to please tell me! Thanks to two very assured comments below, I have now changed the I.D. to an adult male crab spider (misumena vatia). Thank you both. I should perhaps give up trying to identify the bugs I find in my garden as my success rate is woefully low. Anyway, this tiny crab spider was photographed peering over a leaf in a tree rather high up and I was using my macro lens when I spotted it, so these are big crops. A characterful little thing.
Male crab spider (probably)