I applied online. The process took 6 months. I interviewed at National Grid (Northfleet, England) in Mar 2021
Interview
Initial submission of CV and documents, passing this you will have to complete a series of preliminary questions based on suitability, followed by Maths, English and reasoning online tests, then a phone or online interview, if successful you will be invited to assessment center where you will sit an official in person interview as well as examined team based activities and individual activities followed by a maths test paper.
Interview questions [1]
Question 1
What do you know about substations and the power grid.