The original version of the diet wouldn't have allowed it but, these days, it seems ok. I'm not in the UK though so can't say the one your hubby's chosen is the lowest available. People used to talk about Longley Farm one which is virtually fat free or Tesco Light Choices. I'd use sparingly. Could you fill out your stats because it's hard to advise correctly without knowing where you are in your journey, how much you weigh now, etc.
I'm sorry to hear you're housebound. Hope things improve for you soon.
x