If it's one of those lovely old MK sockets like you used to get in the 70s/80s, then the earth pin doesn't open the shutter - it's opened by equal pressure on t

If it's one of those lovely old MK sockets like you used to get in the 70s/80s, then the earth pin doesn't open the shutter - it's opened by equal pressure on the phase and neutral pins. It takes a bit of jiggling to get the Euro plug to go in. I keep both Schuko and UK kettle leads, cloverleaf leads, and figure-8 leads in my laptop bag, having been stuck before.