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Finally got through to EDF Energy who are the supplier/distributor of electricity in my area. They advised me to get an electrician to do cross bonding, and then for the electric supplier to test and connect. They checked and said the freeholder was responsible however when I spoke to him and the lease was checked it turned out there were no covenants in the lease making him responsible for this sort of work and if anything was done by him, the cost would be recovered from me, therefore he suggested it cheaper for me to arrange the supply!