You may find this website “British Bugs” useful. It provides an online identification guide to UK Hemiptera.
Field Guide to UK Hemiptera, Bug identification, Bug, Bugs, Hemiptera, true bugs, heteroptera, homoptera, auchenorrhyncha, leafhoppers, froghoppers, planthoppers, treehoppers, cicadas, psylloidea, psyllids
Source: British Bugs Home – An online identification guide to UK Hemiptera