Talks aimed at averting further shutdowns of the London Underground system ended on Monday (August 10) with little sign of progress.

They will resume on Wednesday (August 12) at the conciliation service Acas where four unions representing rail workers and the London Underground management will try again to find resolution to the dispute over Night Tube working patterns.

Unite, RMT, Aslef and TSSA have suggested that, without concessions from LU management over “work-life balance”, more strikes are likely, threatening the launch date of the 24/7 Tube, planned for September 12.

LU’s chief operating officer Steve Griffiths said in a message to staff: “We have put forward a very fair, revised offer, which recognises not only the introduction of night Tube services, but the work-life flexibility that we know is important to you. We will continue to consult on rosters and you will be able to swap your shifts around.

“This means you can plan the shifts that best suit you. More importantly, no one will be asked to work more hours than they do today. Everybody remains entitled to two days off in seven, and annual leave entitlements are unchanged.”

RMT General Secretary Mick Cash said: “RMT has made it crystal clear from the start that in return for the very basic guarantees and assurances sought on work-life balance that the union will work to agree a final form of station rosters for all areas.

“London Underground and the Mayor [Boris Johnson] can throw out whatever propaganda they like direct to staff but until these issues are addressed, and the threat of imposition of the rosters is removed, the dispute will not be resolved.”

One of the issues that emerged was the delivery of rosters for the first weekend of duty, which includes a night service on the Jubilee line. Unions suggest the publication of rosters was an “imposition”, management said it was releasing plans so staff could be reassured it was staying true to its word.