I went into Sainsbury's (West Ealing, London) to pick up Shopmium's free hot sauce. Mission successful.
But I also found lots of baby food in the reduced section of the store for £0.20p. I bought one of each flavour.
The expiry dates varied. Only five were for May 2018, some weren't until 2019.
From experience with these reduced sales, it tends to be only a few stores. Maybe don't expect too much from your local.
Good luck and happy hunting!