In a non-pedantic context, yes. Otherwise, no.

    A) "I stayed in England"

And you actually traveled in Scotland and Wales but England was synonymous with UK for you. Technically incorrect of course.

    B) "I travelled around Britain"

And in actuality you only traveled in England.

    C) "I went to Europe"

As an American (yes, a US-ian) and you start in Poland at the Baltic sea and then via some nice Eastern European countries with other attractions like Kroatia, all the way down to Greece. But without further explanation and context most people would've assumed you probably traveled Spain, France, Italy etc.