Yep, I felt like I was answering my own question with putting on that pinky was bit bigger so longer to digest but it was only a tiny, tiny bit bigger than normal.
We still have him on kitchen roll so his poo will be easy to spot when he does do it.
He did a big plop last Fri so maybe he's just holding it in!
He's due another feed tomorrow, stupid question but can we still feed him even if he hasn't pooed?!
We had Cornelius out last night, put him on my couch again where he likes to mooch about & only went & found fresh poo & an older poo behind a soft toy on there so he had been pooing all along!! Panic over!!