These are three different hoverflies. It's only when you look closely having photographed them that you can see how different their markings are. The hoverfly recording scheme is a nice site.
The top photos show a male hoverfly on coriander flowers; the hoverflies below, on the calendula, are female - apparent by their eyes, as pointed out by the All About Hoverflies site.
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Please leave a comment. I'm very pleased to receive corrections or confirmations of my identification of the creatures we've spotted on the allotment.