Thanks MM but he does only get a little bit, his main meals are (atm) pouches, he only has half a little cup of Whiskas a day, or at least he did.
He's still not right so I have only given him half a pouch tonight - he is his normal happy little self but Jen had 'something' to clean up in the conservatory this morning, not 100% sure if it was poo or sick. I am pretty certain it is the adult Whiskas biscuits causing it, as he was fine after the Butchers/pouch mixes for the past few days.
Mopsy (cat we had before Tinker) lived purely on IAMs, no meat, was never ill a day of his life, he went out one day and never came home - he was 13. Tinker had a mix of tinned cat food and Whiskas - he was fine (apart from his brush with death aged 8 months, which he completely recovered from) until his RTA last year. My vet was happy for him to eat what he wanted, pretty much, LOL.
I am still experimenting with Smudge atm....we'll get there