Well, right now half of the UK is underwater and the other half is cold and wet, can't blame all the people who disappear off to Spain and South of France this time of year
We can travel around between Wales, Scotland and England passport free since we're all governmentally one country. However I believe one needs a passport to board a ferry to the Isle of Man or to Northern Ireland/Republic of Ireland. Being part of the EU we don't need Visas to travel between EU member states though