I'm thinking of changing my dogs food to Simpson's sensitive has anyone used it? It gets good ratings on all about dog food site, and some good reviews.
Never heard of it but that just could just be because of the difference in Countries, You being in the UK and me in the States. I just switched Stryker from Blue Buffalo Wilderness to Nature's Variety Instinct Raw Boost (Dry puppy food). I use a site called Pet Food Advisor to me decide what is good or not and if there is ever a recall on ANY pet related items I get a notification about it. Sorry I can't be assistance on that brand but check that site out, it's got a lot of great information regarding 100's of different brand dog foods. I think they might even have any option you can ask for them to review it for you.
I did use a Simpson food once, don't think it was sensitive, but could have been! I obviously didn't take to it as I never bought another sack. However, I have heard very good reports from other people.