A. Le Rhone,
you are completely incorrect. You must remember that you will be BASED in the UK, not just operating "ex-uk". The basing requires the right to work in the UK. Inciter, Some of the recently admitted (New) countries dont have the right to work in the UK, so EU citizenship alone is not the answer.
A list of the requirements are published on the Immigration/Visa website. It seems of late that certain managers have been a bit lax in checking the details of a couple of individuals. The MGT believed it was the responsibility of the individual, (funny how they never thought that when there was no problem finding suitable Crew).
However, now the proverbial is about to hit the fan big time. The last thing CX/KA needs is to be caught riding rough-shod over UK immigration rules so soon after being caught with the pants down by the Inland Revenue. So as the mismanagers run for cover, those who have lied about the right to work in the UK can expect a swift kick up the..... .