How Do I Shut Off My Water Supply?

[BlackEarth]

Hello!

I'm planning to replace my bathtub mixer, but obviously need to shut off the water before I begin. There are no valves for the hot/cold water pipes in the bathroom.

The problem: I'm in an apartment and my water tank is old (circa late 80s/early 90s). I can't figure out what needs to be done to stop both the hot and cold water. I'll attach some photos. Any help is massively appreciated, this forum has become somewhat of a lifeline as of recent!

Imgur

 

[Scott_D]

Looks like the stop tap under the water meter

 

[BlackEarth]

Looks like the stop tap under the water meter

That was what I thought, but will that stop both hot/cold or will I need to drain the tank? Would prefer not to drain the tank if it's possible.

 

[Scott_D]

That should shut the cold into the cylinder and therefore the hot out.
Turn it off and try opening the bath taps

 

[BlackEarth]

That should shut the cold into the cylinder and therefore the hot out.
Turn it off and try opening the bath taps

That's done the trick! Thanks.