Social gatherings of more than six people have become illegal in England. Versions of the “rule of six” – explained in detail – are now in place right across the UK and are designed to provide clarity. However, there are significant differences between nations. It applies indoors and out in England and Scotland, but not in Wales and Northern Ireland. In Scotland and Wales, children under 11 and 12 respectively are exempt. A reminder of why this is all being brought in – that crucial R number is rising.