One thing to keep in mind about the Europe thing when talking about European spelling to mean British English is that many UK folks don't think of themselves as 'European'. There are many who do, of course, but I'd say that many UK folks, when talking about Europe, are referring to 'mainland Europe', ie, the land mass to the right of the English channel. Island mentality, perhaps, but there's still very much a feel of 'the UK and Europe' over here; a feeling of them being separate entities.
How do people from countries in mainland Europe think of themselves? Perhaps that's a topic for a different thread, but I'm curious.