Major, who led the UK's Conservative government between 1990 and 1997, accused pro-Brexit politicians of giving Britons unrealistic expectations of life outside the EU.
Prime Minister Theresa May like Major, a Conservative plans to invoke Article 50 of the EU's key treaty, triggering two years of exit talks, by the end of March.
Major said the government's goal of settling divorce terms and forging a new relationship with the bloc within two years is "very, very optimistic."
He said there is a "real risk" that the U.K. Will not get the close free-trade deal with the EU that the government is seeking.
"Behind the diplomatic civilities, the atmosphere is already sour," Major said. "A little more charm, and a lot less cheap rhetoric, would do much to protect the UK's interests."
Major, who backed the losing "remain" side in last year's EU membership referendum, said victorious "leave" campaigners should stop telling their opponents to quietly accept the result.
"It is not 'arrogant' or 'brazen' or 'elitist' or remotely 'delusional' to express concern about our future after Brexit," Major said. "Nor, by doing so, is this group undermining the will of the people: they are the people."
He also cautioned that leaving the 28-nation bloc would weaken Britain's voice in the world and make the UK more reliant on the United States and new President Donald Trump "a president less predictable, less reliable and less attuned to our free market and socially liberal instincts than any of his predecessors."
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
