Originally Posted by
Skipness One Echo
The UK trusts no one and rescreens everyone, even the Irish...
This is actually at the behest of the UK Foreign Office. Intelligence suggested that certain (in fact most) departure countries security etc was fine, while others were suspect. However the Foreign Office would not accept that, saying it would cause all sorts of diplomatic upsets to classify a certain country as not good enough, lead to diplomatic lobbying, reprisals, non-invitation of the UK Ambassador to diplomatic cocktail parties, etc. So the alternative was treat all countries the same.