BT will do normal telephony installations overnight when it fits in with the customers business operations. However, you are probably in a minority of residential customers who would accept or request it ... maybe extending hours to say 06:00 to 22:00 would be reasonable, provided the customer paid a small premium for a 06:00 - 08:00 or 19:00 - 22:00 appointment which would cover the technicians overtime.
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