Marmalade Hoverfly (Episyrphus balteatus) Wing length: 6-10.25mm. Flight: All year.
Species to spot in January
If there is one hoverfly everyone probably can spot and maybe even identify it's the Marmalade hoverfly. It is found in most habitats, but especially common in and around the flowers in one’s garden and by far the commonest hoverfly in the country. It is also migratory and has on occasion caused alarm when they invade from the continent in their thousands. They even reached the broadsheets one year causing mass panic to the un-informed, who mistook them for wasps.
https://www.theguardian.com/uk/2004/aug/03/sillyseason.science
They are not only great pollinators but are also, due to volume in numbers, a superb natural pest controller, worthy of attracting to the garden. Encourage them to lay their eggs (white) so that the emerging larva can feast on the aphids in your vegetable patch, and you may get a better crop of cabbages, as they particularly like those aphids (Brevicoryne brassicae). The larvae which are legless, translucent with orange markings, can eat up to 400 aphids during development to adulthood. It would be nice to think that gardeners and farmers could leave these little ‘superheroes’ to resolve these pest problems, rather than with artificial solutions, especially during their peak months July to August.