London Underground staff in various grades are set to strike between tomorrow and 11 January in the continuing dispute with Transport for London over job conditions, but the union has extended a last-minute olive branch to TfL by calling for ‘unconditional talks’ at the conciliation service ACAS. The RMT said it had been invited to talks with TfL earlier this week after London Underground workers had voted in favour of ‘rolling strike action’ by over 90 per cent against a ‘below inflation pay offer’. The union is also protesting about what it says is the creation of a ‘two-tier workforce’, and is calling for full staff travel passes to be restored.