Yes, this is Xanthogramma pedissequum (although there is believed to be a second and possibly even third British species hidden in the taxon). You will see from the text underneath the maps for hoverflies that the county maps for this group are not based on full county data, so they do not give an accurate picture of the whole recorded distribution. It is a widespread hoverfly, but not usually seen in large numbers.
Your Forum
This forum has now been more or less replaced by the Club's Facebook page at 
The weblog below is for naturalists to use to report interesting sightings, ask questions, report on field meetings and generally post pictures and any information or questions generally relevant in some way to the wildlife and geology of Essex. You will need to register and be logged-on to post to the forum, and you need to upload pictures first, for use in posts. Find out more
The weblog below is for naturalists to use to report interesting sightings, ask questions, report on field meetings and generally post pictures and any information or questions generally relevant in some way to the wildlife and geology of Essex. You will need to register and be logged-on to post to the forum, and you need to upload pictures first, for use in posts. Find out more