The project, initially planned for completion in 2022, has been plagued by delays and cost overruns, with the current estimate for completion now reaching £100 million. Network Rail has identified several potential solutions to address the ongoing delays and cost overruns. These include:

The review is being carried out to assess the viability of the project. This is a significant project with a complex history. The project has been delayed for years due to various factors, including the need for extensive environmental assessments, the complexity of the project itself, and the availability of funding. The project’s history is marked by several key milestones: