As I have decided to take Dylan, Flash and Jesse out earlier in the morning (5.15 am) due to that little terrier, I now have time to take Troy out in the morning too! So now he gets a walk every single day even when I am out in the evenings! Cornel only walks him rarely now, so this is an excellent solution and I think Troy is enjoying it too.
I have now put him on Previcox on a daily basis as he does limp quite badly otherwise. He used to stop eating properly, but so far seems fine. I will now also try giving him one tablet in the morning and one in the evening, perhaps that is more gentle on the tummy as well so he will continue to eat well.