UK Pledges Extra £44m for Channel Border Security
An extra £44.5m is to be spent beefing up Channel border security, the UK government is to say later.
It will be spent on fencing, CCTV and infrared detection technology in Calais and other border points.
It comes as French President Emmanuel Macron visits the UK for a summit with Theresa May.
Britain is also expected to commit to taking more migrants from Calais, especially unaccompanied children, the BBC's James Robbins said.
He added that while Britain and France were heading in different directions as a result of Brexit, both governments are keen to show that they will continue to work closely together.
Other commitments being unveiled include the deployment of three RAF Chinook helicopters in Mali, where French forces are fighting Islamist militants, and France sending more troops to reinforce a British contingent in Estonia on Nato's border with Russia.
On what will be his first visit to the UK as president, Mr Macron is also expected to announce the loan of the Bayeux Tapestry for display in the UK.
Thursday's summit has prompted fresh scrutiny of the border arrangements between France and the UK.
During last year's French election campaign, Mr Macron said he wanted to renegotiate or scrap the 2003 Le Touquet agreement, which established French border controls in Britain and UK controls in Calais.
The agreement means undocumented migrants barred from entering the UK stay in France - many in makeshift camps.
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