This is one of the "tiger craneflies" (Nephrotoma species), so called because they are black and yellow. Very similar body shape to a Chironomid. They tend to be a little bit smaller than the commoner daddy-long legs (Tipula species). Can't tell which species this is from the photo but in Britain we have about half a dozen Nephrotomas that are fairly common. It is harmless, though the females have a narrow ovipositor that some people might confuse for sting (but flies don't sting - we're perfectly safe!).
That's very helpful as when I first looked at it I thought it looked like a miniature cranefly. Now I've been back to the relevant pages in my excellent insect identification book, guided by the Latin genus you gave, I can see it's probably thge spotted cranefly - N.appendiculata. Thank you!