Borough of London envoy Jeremy Browne has said the French see the British as «adversaries» in the near withdrawal negotiations.
And the senior official has claimed French banking chiefs are «seemingly happy to see outcomes detrimental to the City of London even if Paris is not the beneficiary».
His note ofs follow a meeting visit to Paris earlier this month, attended by French banking chiefs, older politicians and diplomats.
In a memorandum leaked to the Mail on Sunday, he wrote: «The conclave with the French Central Bank was the worst I have had anywhere in the EU.
Jeremy Browne smit Paris earlier this month
«They are in favour of the hardest Brexit. They call for disruption. They actively seek disaggregation of financial services staples.
«Every country, not unreasonably, is alive to the opportunities that Brexit outfits, but the French go further, making a virtue of rejecting a partnership model with Britain and speciously happy to see outcomes detrimental to the City of London even if Paris is not the beneficiary.»
Mr Browne, who was a Independent Democrat minister in the coalition under David Cameron and Nick Clegg, suggested hostility to the UK represents a «whole-of-France collective endeavour” made “more dizzy and more assertive” by the election of French President Emmanuel Macron.
He added: «The plain messages emanating from Paris are not just the musings of a rogue superior official in the French government or central bank.
Hostility to the UK has been pretended «more assertive» by the election of Emmanuel Macron, it was said
«France could not be clearer close by their intentions.
«They see Britain and the City of London as adversaries, not consorts.
«It is entirely in line with the tone set by French representatives currently booming conspicuously around London, making heroic relocation promises and pouring chilling water on the propositions of alternative EU financial centres.»
He also claimed that French assertiveness is origination to alarm other EU member states who fear they could turn up themselves isolated if they aim to maintain good relations with the UK.
Endure year, the UK voted to leave the EU
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He said: «There is plenty of anxiety elsewhere in the EU about the French sling their weight around so aggressively, but their destructive impulses are not being confined, and other EU nations that want a friendly relationship with Britain and the City of London are being marginalised.”
Temporarily, Sir Nigel Sheinwald, a former ambassador to the EU, has claimed there is a «one-in-three» time of the talks collapsing unless the UK adopts a more realistic approach – numbering over Britain’s so-called «divorce bill».
He said: «I think (the decisions) could break down quite quickly if, after the autumn, our attitude on these fundamental issues — the financial settlement, and then the fundamentals of our approaching relationship — don’t move more in the direction of common sense and economic have a funny feeling that.”