Cynic wrote :
My local hall has an outside tap. To avoid massive water bills through the
local miscreants turning it and leaving it running all night/weekend we have
taken to turning off a valve inside the building. This year we have planted a
collection of wildflowers and others which until they are established need
watering.
The cleaning lady is happy to do the watering but she isn't very tall and
can't reach the inside shut off valve. I'm thinking if the outside tap was
operated by a key (Yale type) it would simplify the task. The only key
operated valves Google seems to be able to find are simple, square/triangle
lockshield types.
Does anyone know if what I'm seeking is available?

Could you not take the top handle off the tap and keep it inside?