Tribune unvented cylinder - turn off hot supply?

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Hi I have a Tribune HE unvented cylinder.

I have a leaky sink tap in the bathroom which i want to replace the washer on, however I can't seem to stop the hot water flowing.

Photos attached.

I have closed off the red tap at the top. (black arrow) This seems to be the hot supply to the bathroom etc. The rest of the pipes are cold so i assume cold supply to the tank.

How do i turn off the hot water to the bathroom so I can repair the sink tap?. Do i also need to turn off the stopcock?
 

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If turning off the red tap (gate valve) doesn't stop the water then it isn't working properly, gate valve's are notorious for not closing especially under mains pressure. I can't tell but do you have hard water and is that limescale on the top and right hand side of the tap, I can't tell as TBH the pic's attrocious. If so that'll be another reason it's not closing properly.

Mains cold supply is the only other option, remember it will take a little time for the pressure to release and for the water to stop running, it won't stop straight away.
 
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Here's a better photo. The white substance is chalky. This is a medium to moderately hard water area.
 

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As said, if the hot outlet gate valve doesn't shut off the flow, try the cold feed isolator to the cylinder and run all hot taps until they stop.
 
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Yup, the tap will probably be crusted up inside, so isn't closing down properly. When the mains is off and the pressure released then change that for a 1/4 turn full bore lever valve and manipulate it a couple of times every few months to stop it jamming up.
 

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