This is another one of the big, easy to do hoverflies - Volucella inanis. (Not as easy to do as I blithely claimed. Andrew Cunningham has quite rightly pointed out that this is V. zonaria) It barged it's way past all of the puny flies, wasps and beetles to land on some ivy and show off its awesome build. They really are spectacular these large hoverflies. If only they were all as easy to identify - but there again there wouldn't be any challenge, would there?