In relation to Oscars, it's very similar in formulation to several other good quality pet foods, but a bit more expensive than some.
Their 15kg Lamb & Rice is £39.95 which is a few £s less than Burns or James Wellbeloved, but more expensive than, say the Pets at Home Wainwright's food which is another 'natural' food and goes out at £29.35 for 15kg (check out the range on their website www.petsathome.com
And of course you can get this delivered to your door if you don't live near a store