It's difficult to know whether TfL or the Olympic Delivery Authority (ODA) will run out of money first.
On current form it looks neck and neck.
TfL announced this week that it has descoped the proposed four tracking of the North London Line between Caledonian Road and Camden to a two track affair.
The grounds for this was the poor condition of a number of bridges along the route that would have required renewing.
By not four tracking throughout the project saves £40 million.
However, the removal of two platform faces at Camden will prevent the delivery of an 8 train-per-hour service throughout the day.By not four tracking throughout the project saves £40 million.
Which may disappoint the cash strapped ODA who are reported to have put £100m into the scheme to help move people to and from the Olympic site.
Poor BoJo. What looked like a £40m saving may soon turn into a very large bill from the ODA.