61. Northern Powergrid may from time to time and at least monthly from the date of this Order issue to the undertaker invoices for costs and expenses incurred up to the date of the relevant invoice, for the amount of the relevant estimate agreed. Invoices issued to the undertaker for payment must—E+W
(a)specify the approved purchase order number; and
(b)be supported by timesheets and narratives that demonstrates that the work invoiced has been completed in accordance with the agreed estimate.
Commencement Information
I1Sch. 12 para. 61 in force at 25.10.2019, see art. 1