This is my first “dagger fly” found in the garden; so-named because of its long beak. These come for nectar, as in this case on the flowers of a bramble, but are also predators. Courtship consists of the males offering prey to females, with the most favoured prey getting the girl. There are a few species, but this one with it’s reddish coloured legs (including the thighs) is I believe one of the commoner ones.