The current Prime Minister believed the bridge would have given a boost to the British tourist industry.
He wrote on Twitter: “Our economic success depends on good infrastructure and good connections.
“Shouldn’t the Channel Tunnel be just the first step?
Ms Le Pen has now said of the proposal: ‘Boris Johnson is a very creative and always surprising person.
“Anything that can link our countries deserves to be considered. “
With Ms. Le Pen on board, the bridge could indeed see the light of day.
Eurotunnel bosses have called for a meeting with UK officials over a second UK-Europe crossing in 2017.
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The note from Eurotunnel CEO Jacques Gounon said: “The idea of a second fixed link is something that we regularly consider in our long-term plans and we would be delighted to engage with your officials to explore further. before this possibility. “
A source from the company told the Telegraph that demand was increasing and a second connection would have been needed.
They also confirmed that the letter was sent just after Mr Johnson’s remarks about building a bridge.
The company said it was “fully committed” to “providing the best possible solutions for industry and consumers in the post-Brexit relationship”, adding that “exploratory work may be worthwhile now”.
The letter added: “The recognition of such potential is a strong indicator of confidence in the future of the economy. “
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Bridge designer Ian Firth, former president of the Institution of Structural Engineers, said a channel bridge – possibly with a section of tunnel in the middle to avoid impacting one of the tracks busiest maritime routes in the world – was not as far-fetched as it might sound.
He told BBC Radio 4’s Today program: “It is totally doable. Prior to the construction of the tunnel, bridge options were being considered.
“There are bridges of a similar – if not quite the same – scale elsewhere. Of course, that wouldn’t be a great range – the economy may lean towards something like ranges of 800m to 1km.
“It would be a huge undertaking, but it would be entirely possible, and the shipping impact issues could be resolved. “
Despite the enthusiasm, Ms May’s official spokesperson has repeatedly refused to support the idea.
The French Minister of Finance, Bruno Le Maire, was also lukewarm towards the concept of a bridge.
He told Europe 1 radio: “All ideas deserve reflection, even the most eccentric.
“We have major European infrastructure projects which are complicated to finance. Let’s finish the things that are already in progress before we think of new ones.