The RMT union has suspended the strikes, while a new offer is put to members in a ballot. The ballot result is due on July 28 with RMT's general grades committee recommending acceptance of the offer.
RMT general secretary Bob Crow praised the determination shown by members in winning the 35-hour week, the introduction of which management had long been stalling.
'While there is no doubt that negotiations on our claim have been protracted it is worth remembering how far we have persuaded the company to move,' Bob Crow said.
'Their first offer, made in February, was for a three-year deal that gave only 0.5 per cent in year one. In addition the 35-hour week would not have been fully introduced until April 1, 2008.'