Nothing vicious about it - just an innocent Common Bee-fly, Bombylius major. These are a good spring fly and lay eggs near nesting aggregations of various solitary bee species. When eggs hatch the larvae enter the nest burrows of the solitary bees and feed on the pollen and nectar resource put there for the bees own larvae. This lifestyle is known as cleptoparasitism and that's about as sinister as this fly gets. The long proboscis is simply used to feed on the nectar of long tubed spring flowers.
So surprised to receive two really informative replies so quickly. Thanks very much. Following up on these replies, I'm glad to see that in Warwick our insect life is following the correct seasonal trend!!