Balfour Beattie on behalf of Northern Gas Networks is replacing the gas main in Thorp Avenue between 25th Feb and 17th March.
The contact for enquiries is 0845 634 0520 email: firstname.lastname@example.org
Update: Balfour Beattie say that the maximum time the gas could be off would be 8am (more likely 8-9am) through to 5pm (more likely 4-5 hours total) - the 9pm switch-on is for people not in during the day.
They say that 24 hours notice will be given - and they will provide heaters on request, if people call the contact number (above). And they'll have some spare heaters with them on the day, in case...
Age Concern Morpeth and Morpeth Town Council have been alerted
Balfour Beattie also say they sent a letter to NCC Social Services about all this a month ago - but so far I haven't been able to find out what has happened to that letter.