Broadback wrote:

[...] The tree surgeons say the power from the adjacent
pole will have to be disconnected for the work to be carried out, can
anyone please tell me what the charge for that would be

Yes, the electricity DNO (distribution network operator) for your area
will be able to tell you, when you ask them to quote. This link should
help you find out who you need to contact:
http://www.energynetworks.org/spring...lect_contr.asp

PS - I suspect the answer is likely be more than you think...

--
Andy