Burgess Hill is one of the better franchises. New guy took it over last year and has kept it to a high standard, unlike the Broadwater and Durrington ones which are pretty poor.
Here is the Argus story about why he has down sized the Grubbs empire
https://www.theargus.co.uk/news/19311199.brighton-burger-chain-grubbs-reveals-reason-downsizing/
I’m old enough to remember when they also had a shop in West Worthing where Ace Burgers &Kebabs now operate.