Had the same probem of cats going 'off' Tesco Luxury, Natures Menu and Hi Life.

However they have been eating Bozita (available from Zooplus) for 9 months. Bozita has lots of flavours, so I alternate the flavours each day. They also get Butchers Classic (Sainsbury, Asda, Waitrose) mixed in as this food is cheap (£4 ish for 12 * 400gm tins).