Another welcome (albeit a little earlier than expected) visitor to our Maris Pipers this morning.
A Capsid or Mirid Bug. Superficially similar to a ShieldBug, but not part of the same family.
These can be recognised by their obvious cuneus (the triangular bit on their back) which is very often a different colour to the elytra (wing cases) and the most striking thing about them.
This one, I think, (for the record) is Deraeocoris ruber - not that thats particularly relevant.
Its bleedin' quick though (like Ladybird larvae), and that explains the slightly out-of-focus-snapshot.
The Capsid/Mirid bugs tend to fly later in the year (think July-August) and love to chow down on those nasty nasty aphids. Great stuff!