Would definitely put my money on a floating neutral as some stage some Dno have a search function on there site to advise if there have been any incidents in the locality
I would terminate into a suitable grp buzz Bar enclosure with powersafe panne mount connectors and uses a set of single cables with the appropriate connectors as below
Done something similar before got two units made by ec services in Bradford double pole mccb front end and a at dwelling end was small bus bar set up got both for around a grand to my exact spec
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