Transport for London (TfL) today issued the following statement.

A TfL spokesperson said: 'There has been an exchange of letters this afternoon between London Underground (LU) and the RMT leadership via ACAS to set out the basis for further discussions at ACAS on the remaining issues in dispute, notably redundancy arrangements.

'Further face-to-face discussions between LU and the RMT leadership will take place at ACAS as soon as possible.'