Some great websites for dog food ratings are dogfoodadvisor.com and allaboutdogfood.co.uk. Click on this link
to see how they rate Butchers. The tripe mix one is rated higher than the normal one, but it's still 2.8 on 5 so not the best quality unfortunately, but not the worst either. Judging by the ingredients alone, at least it doesn't have a ton of fillers like many other foods. The ingredients are quite simple and grain free which is good.
I know how hard it's been for you to find a food, Mylo is such a fussy little thing. lol If he likes tripe, have you tried just mixing some into another higher quality wet food?