Isolation spigots what's wrong please

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Broken washing machine isolation tap handle preventing water shut-off

The problem

The washing machine needed to be laid on its side to clear latex rug backing from the pump, but one isolation spigot handle would not shut the water off properly. The blue plastic handle turned very easily with no resistance, suggesting it was not operating the valve.

Likely cause

The strongest supported diagnosis is a failed or stripped plastic handle on the isolation tap, rather than the valve being turned correctly.

What fixed it

The accepted advice was to remove the broken plastic handle and turn the isolation tap off using pliers. One later reply also said replacement solved the same issue, but no exact repair to this specific appliance was confirmed beyond the diagnosis and advice.

Checks to try

• Machine was run after turning the spigots and it still filled with water
• Blue plastic handle twisted freely with no resistance
• Blue spigot had previously turned easily but did not stop the water supply

Parts or tools mentioned

• pliers