sentences:  According to TfL, HCC had significantly underestimated the costs and the project was faced with "significant project slippage and cost escalation", and for this reason an agreement was reached with the DfT and HCC whereby London Underground would assume full responsibility for the project, subject to a suitable funding package.Hertfordshire County Council would now contribute £230m, £34m would be provided by central government, and LU was to contribute £16m.The opening date was put back to 2020.