Isotoma viridis

This is very probably I. viridis. The species is hard to separate from I. anglicana and it's better to do a microscopic examination. One diagnostic character is the structure of the pigmentation in the cuticle - from what I can discern on my original image (full res) the skin on this one should be okay for viridis.
Please refer to the excellent site by Jan van Duinen for more info:
http://www.janvanduinen.nl/collembola_b.html#15