I have been asked to replace a broken window hinge. I have not seen the window but I have been given the piece of broken hinge. It is a tilt and turn uPVC window. I can find places that sell the complete windows but not the hinges on their own, any ideas?

Z, different systems use different tilt and turn mechanisms. A few might use the same, but you'll still get, say, three different types on five different systems.

See if you can identify the upvc system, or at least get the t&t mech name off it and then ask your local upvc supplier (there are several in Kiddy) if they can identify it, in which case you can then probably get a replacement.