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Which exchange and cabinet?
As your cab is fibre enabled and nothing showing on dslchecker you can only wait and hope openreach erect a new cab closer to you but as there does not appear to be a lot of people that may be a while if at all
isnt there a way of getting better speeds though? not even copper wiring to the house? 4mb is awful yet we paid for 8mb
as you can see from checker the estimate for your line is 4.5/6.5mb connection speed
have you tried using the test socket with a filter as that often helps improve conenction speed by eliminating your onternal wiring and the faceplate