Thanks markc, joe90 and Steamy Tea for the welcome.
The utilities issue is the quagmire of getting a run of overhead high-voltage cables moved that are impinging on the build.
Have perused these forums, and also purchased what I think is probably the definitive textbook on the subject, before entering into correspondence with the distribution network operator.
Suffice to say that the DNO are seeking permissions from a neighbouring freeholder, so something is happening, however my suspicion is that my small job is not a high priority for either the DNO or the neighbour!