Trade talks began in March but on several occasions have been on the brink of collapse, with both sides refusing to move on crucial red lines including fisheries, state aid and the EU's level playing field.
Mrs May had famously insisted "no deal is better than a bad deal" as she stood her ground in the early part of negotiations with the EU.
But Brexiteer and Conservative Party MP Sir John Redwood said as soon as the former Prime Minister dropped this slogan and began to bow to EU demands, "she left the UK unable to get any kind of decent deal".
He wrote in his latest blog post: "Mrs May had the right approach and the right slogan when she first embarked on negotiations over the UK’s exit from the EU. 'No deal is better than a bad deal'.
"If she had stuck to that we would now either be completely out with no deal, or more likely out with a Free Trade Deal to protect EU tariff free entry to the UK market and vice versa.
"Once she dropped this important statement and revealed a continuous wish to give in to most demands the EU made she left the UK unable to get any kind of decent deal.
"The EU perceived the UK as weak and willing to recreate many features of its membership without the votes or voice. This was all much chronicled here as elsewhere, as delay followed concession and concession followed delay.
"UK voters showed their massive disapproval in the European elections which should not have been needed had we simply left as planned, and went on to confirm their clear wish to leave the EU with or without a Free Trade deal in the General election of 2019." Express.
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