Shower tap is stuck, won't turn

Shower tap is stuck, won't turn

Shower tap is stuck, won't turn

Hi,
Please help in finding ways to make my shower tap work?
At the moment the shower is much too hot to stand under. This is because
only the hot tap works. The cold one is stuck.
I suspect it may be limescale. I live in Luton, where the water is known to be very hard.
Ive only just moved in to this rental flat.

Can I somehow squirt descaling liquid into the gap of the tap?

by eem2am

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