Chris has had the reply below from his contact at EYCC / BT.
I've contacted BT to check on progress. Unfortunately they have to do some additional ground works to get light to the cabinet before it can go live.
This has meant a delay in their go live date, now set for the end of July. However, they are working to complete the work as soon as possible.
I've asked them to keep me in the loop on any changes in progress, and I will be in touch as soon as the cabinet is live.