First West of England managing director Doug Claringbold said: “These [strikes] are unnecessary and, most importantly, hugely disruptive to our customers, and it is within the hands of the union to stop this action.
“We have always maintained an open dialogue with the union and while they continue to reject our full and final offer, which has been accepted by other areas in our region, we still hope to find a solution to encourage the union to call off their strikes.
“I was pleased that during the first day of strikes this week we kept about 60% of services within, and serving, Bristol running.”