TBH unless its a normal old fashion tap. i have yet to find a hose connector that will stay on.
Your tap has an angle, the "clamp on" style connectors have an awful habbit of slipping.
I would suggest you fit an outside tap (following water regs)
useless but true: If you have a non electric shower you can undo the actual shower from the pipe, put a 1/2 inch compression connection on the shower pipe (hand tight) from the other end have a 15mm pipe with either a hose connector or the actual hose. But dont drop it as the connector my damage the bath. It really does work, i have to do this at my mum's if i need a hose