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M (Syrphus) - I have agreed (it's a worm!). You are right, they are not easy to separate, specially the very red ones and this picture is far from good enough for a better ID, though fully enlarged it is very good - one picture is never enough sjb365 .
Placing hotlinks in ID panels has always been difficult (only achievable using HTML code). In any case yours is flawed.
Here it is (2014 version) http://www.opalexplorenature.org/sites/default/files/7/file/soil-survey-...
THREE MARINE PROJECTS
Lat/Lng: 53.8, -1.8
OS grid ref: SE1940