I need to thread the wire through a tiny hole but can’t get the plug off as it all seems sealed.

Yep. Think you’ll have to cut it off and start again with the wires.
You’ll need a new plug though…

It is, snips.

You don’t. It’s a moulded plug.

Only way is to cut it off and put a new plug on or open up the device and remove it from the other end.

Or make the hole bigger.

edit: beaten by 7 seconds.

Make the hole bigger or cut off the plug and re-wire it.

FFS Darwin is waiting for you! 👿

Snips and fit a new plug. Or go totally mental and dismantle and disconnect from the appliance end?
RM.

If you don’t want to mess with the plug you could make up a small single extension lead with removable plug and pass that through the hole. If you do then (I am guessing that is a washing machine) you should make sure the plug is fixed high up and not on the floor behind in case of leaks.

Make sure it’s not plugged and switched on when you cut it….

If it’s attached to something that is in warranty then as andyl says

Sorted. Managed to reroute through the back of some cabinets. Plug remains unsnipped though my knuckles now need attention…

Thanks folks.