8 months delay for delivery of batteries, office of gas and electricity markets (Ofgem) supporting project do not seem that happy !

https://www.ofgem.gov.uk/ofgem-publications/90750/approvalofntvvesmuchangerequest2014.pdf

Conclusions

We note that this is the second change request on this aspect of the project in a relatively short period of time. We expect distribution network operators to consider issues and changes in circumstances in their entirety, plan and implement their mitigations carefully and alter their plans appropriately. The number of changes required by this project and on this aspect raise questions about how well planned and implemented the project has been to date. It would also appear to raise questions about the readiness of the project at the time of submission. However, we accept that the changes in circumstances have impacted the timescales of this project.