There are some outlets still in use in older properties which were designed only for the British 5A plug though. European plugs will go in though with force, especially if the plug has the softer type of molded plastic which allows the pins some movement.
If you can get the European plug into the same socket as this plug, either the socket has very big holes or you have a very flexible Euro-plug. It doesn't really show in the photo, but the pins are much closer together than the Euro-plug.
Compare this with my photo at the top of this thread -- The plug at the bottom right is a 2-pin 5A type.
Do you have this plug? Could you measure the distance between the pins? (Sorry if I'm troublesome...)
