Jeremy Corbyn, who had initially refused to engage in cross-party talks with the prime minister until no-deal was taken off the table, described his meeting with Theresa May as "exploratory on the issues".
He said he had "set out the Labour case for a comprehensive customs union with the European Union in order to protect jobs in this country".
Despite the amicable tone of the meeting, Mr Corbyn remained "suspicious" that Mrs May was trying to "run down the clock" on Brexit.
He warned: "The whole process looks like it's running down the clock by saying, well, it's either the problems and the difficulties of no deal or support a deal that's already been rejected by the House of Commons."
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