Catherine McGuinness highlighted how important it was for the UK to secure an “agreement” with the European Union.
Speaking to Sky News, the City chief also reiterated that a massive decrease in jobs hadn’t been seen following Britain’s decision to exit the bloc.
She said: “I think this is a critical moment and I was pleased to hear what was just said about needing access to the brightest and best we plainly do.
“London has thrived on being open to talent.
The City chief explained that there have not been many job loses since the Brexit vote
“We need clarity as early as we possibly can so that businesses have certainty on which they can work.
“We do need access to markets, in fact, I think for Europe as well as for London, we need an arrangement which allows for two-way access to the single market.”
Ms McGuinness, the new Policy Chairman of the City of London, described the upcoming Brexit negotiations as “challenging times”.
She said: “These are challenging times. I think it is tremendously important that we put calm pragmatism as far as we can to the front.
We need an arrangement which allows for two-way access to the single market
“I realise over the next couple of years we are going to see politics driving much of the way but it is crucially important that we look at financial stability, we look at this as the global gateway to capital for Europe as well as for the UK, and we get a deal which works for the ordinary people that actually this industry serves.”
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Speaking to Jeremy Paxman, the Prime Minister reiterated that she would be a “difficult woman” to seal the best possible deal with the European Union, but was not scared to walk away.
She said: “I'm not prepared to sign up to a bad deal to the UK. We're in there to get the best deal for the United Kingdom.
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“I’m optimistic because I think the European Union will want to continue their relationship with us. We'll be negotiating hard.”
The City chief finished by reiterating that only a few thousand jobs had moved to EU member states following fears more could leave the City after Brexit.
She said: “I have to say at the moment we are seeing very few jobs going, still in the low thousands.
“These are people making contingency plans, institutions making arrangements so they can carry on working if we do find ourselves leaving without a deal, but people still want to stay here.”