Sinn Fein vice-president Mr Pat Doherty said his party had inserted a strong sense of reality into the talks.
Mr Doherty was speaking after he emerged from the round table session at Hillsborough.
He said: "We told the British government it was entirely their fault and responsibility for not living up to their commitments of May of last year."
Mr Doherty said it was unacceptable that Mr Trimble was attempting to run an apartheid executive by excluding Sinn Fein representatives from the north-south meetings.
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He said Sinn Fein had given the smaller parties a detailed assessment of what had been agreed by the British government last May and said that the only way forward was for Mr Blair to fulfil those commitments.
PA