Taplow
This hoverfly is probably a Syrphus ribesii, although there are apparently two other Syrphus species and they are all very similar. Typical.
I managed a marginally better shot of the kite this evening, with the added interest of a wing-tag that's almost in focus. The right wing bore a pink tag.
The kite was fairly vocal, frequently uttering a rather plaintive and not unpleasing call.