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by ErroneousBosh 17 days ago
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.