Hoverfly lagoons are a fantastic way to help these wonderful pollinators. We first made one after spotting the interest that the hoverflies were taking in our pond. It’s a great project to do with kids and really easy. It is also something you can do if you are unable to have a pond and/or have limited outdoor space, but also worth doing even if you do have a pond to help a wider range of species.
Buzz Club have this excellent page and a project, which runs from May to October, where you can get involved in some citizen science