I'm all for Pets At Homes premium dry food - it has almost identical ingredients to James Wellbeloved but is more suitable for my wallet!
You can go into a PAH and ask for a sample, that is what I did. Jameson loves all the flavours (salmon, tuna, chicken, lamb) - I think he prefers the Lamb flavor.
They often do deals at PAH too, all of my bags have so far been BOGOF, so very economical.
Since I started feeding Jameson this food I've noticed a difference in his fur - very sleek & shiny, and he looks more slender than before (when I fed him cheap supermarket bisquits)