Bumble bee mimic

I have volunteered to do Bumble bee transects and am currently learning to id them .Today what I thought was a small bumble bee ,both by sight and sound ,came near me as I worked.On closer inspection however it turned out to be a Hoverfly Volucella bombylans, a bumble bee mimic.A really beautiful insect that feeds on flowers and hedgerows,the larva scavenge in the nests of bumble bees and wasps.
The female enters the nest to lay her eggs and if discovered and stung by the bees or wasps  lays her eggs immediately by reflex action ,her death not being in vain !