My cat Jumpy is on the RC Sensitive wet chicken and rice - he also can't eat the dry version! He can eat the dry Advanced Nutrition crunchies from Pets at Home, they seem to be ok for him, they are quite low in grain.
He also has Butchers Classic which is good for sensitive tummy cats! And Hilife fish, I would like to find other things he can eat too though, as I think the RC is making him pile on the weight lol!!
(He loves finishing up the other cats' bowls...)