There have been calls for Crossrail to publish all details of its board meetings over fears the delay of the Elizabeth Line extension is harming the Greater London Authority (GLA) budget.

These calls came from the London Assembly budget and performance committee in response to the Mayor of London’s draft budget for the GLA – which includes Transport for London (TfL).

Concerns were raised over TfL’s budget following the delay of the Elizabeth Line extension – managed by Crossrail – which was due to open in December last year but has now been delayed until autumn 2019.

The Elizabeth Line will run between Liverpool Street and Shenfield but the £15.8 billion project ran out of funding last year and is now being supported by a £300 million joint funding package from TfL and the Department for Transport (DfT).

The chairman of the London Assembly budget and performance committee, Gareth Bacon, said: “The enormity of the Crossrail delay has been a body-blow to Londoners and London’s prestige. It puts more pressure on the Mayor’s financial plans and could restrict his ability to fund other critical projects.

“This is especially worrying when he faces huge pressures on all sides, including the urgent requirement to support high profile policing at a time when violent crime is so visible.”

The assembly’s is now calling on Crossrail to publish all future agendas, agenda papers and minutes for the Crossrail Board and the Crossrail Sponsor Board meetings, which are normally held in private, to avoid any more problems happening which could affect the GLA budget.

Mr Khan was also accused of “fuzzy targets” in his draft budget.

Mr Bacon said: “Fuzzy targets cannot become an excuse for a culture of backsliding and sidestepping.

“We hope the Mayor will update his budget to reflect our concerns and stiffen the spine on his planned body of work.”

The current GLA budget assess its targets on a red-amber-green-rating but the response by the committee says this can be “over generous” of what is being achieved and present a “misleading picture” to Londoners.

A spokesperson for Mr Khan said: “TfL’s recently published Business Plan sets out how they will be handling the financial implications of the delays to the Crossrail project, and how they are pushing ahead with our ambitious plans to make London a cleaner, safer, healthier city with more affordable and accessible public transport.

“TfL have a tight grip on reducing costs, and with their continued savings and revenue growth programmes have delivered more than £500 million per annum in net operating savings.

“Freezing TfL fares has also helped cushion London from the severity of the impact of falling passenger numbers seen elsewhere around the country.

“TfL remain on track to reduce their net operating deficit by more than £200 million this financial year, as they work towards an operating surplus by 2022.”