You will have to book a technician call-out for this (£25 standard fee). Extending the cable by this much is likely to adversely affect the signal levels at your property. So the technician will make up the required cable, test the levels & then make any required adjustments in the street cabinet to keep your connection at optimum performance.
Multiple threads merged - Please do not post multiple threads with the same issue, as not only will it cause confusion, it is also against forum rules. Thanks