There is a tiny metal screw to remove (dont throw it away) then the plastic handle will pull off. You might find a new handle in the local Homebase, B&Q type shop.
when you undo the screw you will find a square spindle that you can turn with a very small spanner if you need to turn the water off until you fit the new lever
you might as well buy a complete new valve. It sounds like your old one is getting stiff. Sometimes they come packed with a red and a blue lever.
There is a tiny metal screw to remove (dont throw it away) then the plastic handle will pull off. You might find a new handle in the local Homebase, B&Q type shop.
Undo the screw that holds the blue handle onto the valve ,and pull the handle off. You can operate the valve with a spanner on the square end shaft that the blue handle sits on.
There are different manufacturers of those isolation valves ,and the plastic handles are not always interchangeable. Easy enough to fit a complete new isolation valve.
I have an old Britool spanner, with (I think) a 1/4" and a 3/8" tapered square, intended for brake bleed nipples on old cars, which seems to fit most plumbing spindles.
Replace the valve or the lever. Don't leave it and don't rely on a spanner which you might not have to hand should you need it.
Every now and then, water appliances **** themselves and **** water everywhere. you need to be able to shut it off quickly.
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