George,
The UK visa rules are now quite strict in theory; both Indian and Pakistani visitors need visas for example, whereas the 'Old Commonwealth' do not, so Australians have visa-free travel for example. For the current list see: http://www.ukba.homeoffice.gov.uk/po...les/appendix1/
Yes, there are gaps and fraud can allow entry. For example an Indian national wanted for a Mumbai terror attack in 2006 got entry to work here and then disappeared: http://council.smallwarsjournal.com/...ghlight=mumbai Post 5.
The US DHS regularly raises the issue of visa-less travel by UK nationals to the USA, not that they are worried about Mr & Mrs Smith.
davidbfpo
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