Isolate Worcester bosh boiler leaking

[johnny2007]

Hi everyone, my neighbour has a leak from his boiler and can't find a plumber to attend today.
Is there any way to isolate the water to the boiler but not to the rest of the house?
It's a Worcester Bosch 24i junior.
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[Gasguru]

Turn the boiler power off at the wall.
A common leak is the LHS plastic manifold pin holing.
The 2nd pipe (15mm) along from the RHS...follow it up into the boiler and turn the isolating valve 90 degrees.
Hopefully that will stop it. Don't use the hot taps.

 

[johnny2007]

The 2nd pipe (15mm) along from the RHS...follow it up into the boiler and turn the isolating valve 90 degrees.

Is it the slotted bit that I circled or should I look for a plastic handle of some sort?

 

[johnny2007]

Is it the slotted bit that I circled or should I look for a plastic handle of some sort?

Yes, it's that one.
Leak stopped and cold taps still have water.
My neighbour says thanks.