‘British spies were first to spot Trump team’s links with Russia’:-
https://www.theguardian.com/uk-news/2017/apr/13/british-spies-first-to-spot-trump-team-links-russia
&
GCHQ ‘told US security services about meetings between Donald Trump’s team and Russia’:-
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‘Ex-MI6 chief says Donald Trump may have borrowed money from Russia to keep his empire afloat’:-
http://www.mirror.co.uk/news/politics/ex-mi6-chief-says-donald-10217616