By Sian Baldwin

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London Underground services are back to normal for this working week – after five days of travel chaos caused by the RMT strike last.

All Tube lines are back in operation after coming back to life on Friday, following the lengthy strike across a number of lines.

The dispute centred on demands for a reduction in the working week to 32 hours by the RMT union, and still have not been resolved.

So what happens next? Is more chaos on the cards imminently?

Here is all we know:

The issues between the two sides have not reached a conclusion, meaning the row is currently ongoing.

The RMT still dispute the working hours their members have to agree to, and instead want a 32-hour week – reduced from the current 35 hours expected.

Before this was a demand from the union, but following the strike action, the language has now changed and they say they want “steps towards” a 32 hour week instead. In working practice, it is not known what this means.

Transport for London previously said this was a sticking point they could not get over.

It says even a 30-minute reduction in the working week would cost £30m a year. A reduction to 32 hours, according to TfL, would cost over £200m.

London Mayor Sadiq Khan did not get involved in last week’s action, but it has been suggested he has now.

On Thursday, the general secretary of the RMT Eddie Dempsey told the BBC that he was putting in the foundations for talks between the rowing parties.

He said: “We are pleased to see finally that Sadiq Khan has instructed TfL to meet us…so I’m now waiting for a formal invitation and once that is received we will go straight back to talks and a resolution so we can get London moving again.”

The mayor told the London Assembly on Thursday he “expected talks to resume between the RMT and TfL soon.”

TfL has invited the RMT to talks on this coming Wednesday (September 17).

Bosses say they have not been instructed to do so by the mayor and that they wish to get an agreement in place.

At present, the answer is not known, but without a deal there could be.

For a deal to be hashed out, it would probably take compromise on both sides, which has not been evident so far.

However strikes that were due to take place in north-west and south-west London over the course of last weekend (September 13 and 14) were called off, which could mean a glimmer of hope.

For another strike to happen, union members would have to agree via a ballot vote, and that has not happened yet.

If workers did vote on the issue and agree to strike, details typically have to be given to TfL at least 14 days before it begins.