Hi again. Here's one I dissected earlier. It's a male
Cacopsylla visci. The genital segment has been removed from the tip of the abdomen, and is sitting separately, above left, but flipped over (just to confuse you - left and right are reversed!). I've magnified it, inset. The parameres are the dark structures on the right, and the aedegus is the fine pale brown line running up the middle; ignore the large dark bit on the left, because it's just not useful. The most important part of the aedegus for ID is the little exanded flange at the tip - the precise shape of that is vital for some species!
Any help? The RES guide for psllid adults is ok, but there is far more detail in Ossiannilsson's Fauna Entomologica Scandinavica vol. 26 (include almost all native UK species). I find it very hard to get very far with the RES volume alone, but the combination of the two works well.