From Openreach's website
Q: My cabinet has been repeatedly delayed, and now appears to have been moved from March this year to the end of your programme in 2014. Why has this happened?
A: Deploying fibre cabinets is a complex engineering challenge, which involves not only provision of fibre, but availability of power connections, planning consent for the cabinet itself in some cases, road closures, traffic management permissions and space within our duct network to make the necessary connections.
In a small number of cases we encounter problems which can delay the cabinet by several quarters, and take time to resolve; in the vast majority of cases these are caused by power provision and local planning permission. We work closely with the power companies and local authorities to minimise such delays.
In order to avoid repeatedly delaying these cabinets, we have moved their due dates to the end of our commercial programme to reduce multiple changes to the likely activation date. We will continue to seek solutions for these cabinets and where possible will activate them before the end date given.