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On Wednesday, the company said it was taking "proactive measures" to fend off the attack which it said had had a "small impact" on its call centre and back office.

It said the "proactive measures" it had taken to fend off the attack had had a "small impact" on its call centre and back office.

She told the BBC's Sunday with Laura Kuenssberg programme that government running costs would be cut, with savings made from back office and administrative roles rather than front-line services.

Some see sense in mergers, cutting out the duplication of back office costs and the notoriously high salaries of principals.

Alexander said the DfTO is key to ensure that Great British Railway "doesn't end up as an umbrella of 16 separate organisations, each with their own incentives, back office systems and structures but instead becomes one integrated team, relentlessly focused on the passenger".