What a week for National Grid! From the return of the NISM to the sale of the gas distribution businesses, it hasn’t been out of the headlines since last Tuesday, when Steve Holliday’s departure next year was confirmed and John Pettigrew was revealed as his successor. Pettigrew’s a Griddie through and through, with 25 years’ experience at the organisation under his belt. But he faces an unprecedented set of challenges as he steps up to take the top job. What’s going to be filling up his inbox? We’ve got a few ideas: