Similar story here, continuing on my Red > Origin > Red churn-ey.
24 Dec (36 days) - Applied to move back to Red
13 Jan (56 days) - Customer retention call from Origin, told them where to go
18 Jan (61 days) - Meter read
24 Jan (66 days) - 10k points show up dated 22 Jan
25 Jan (67 days) - "as of 18 Jan you are a Red customer" confirmation email
No SC or gas points yet, but assuming no issues there, this felt like worthwhile hassle for 25k points + 30 SC. Will probably put a note in my diary to look at what promos are running in 11 months time and kick off the process again. Certainly don't need to leave Red for a full 12 months to be eligible for bonus points.
The move to Origin did trigger a utilities consumer credit enquiry with Illion but nothing on Equifax/Experian. Switching back to Red didn't show on any of my files.