i would also add non-specific something - not sure how to word it, but if he sees something that needs doing, do it! if you give him a list, and he does what is on it and ONLY what is on it, you're still leaving yourself a hell of a lot to do... Ali's idea of the "full list" will help him and anyone else that turns up to help to have an idea what to do. it will also help YOU cos you can look at it and realise that, as much as it was done in dribs and drabs, you HAVE achieved things during the day - even if it's just loading and unloading the dishwasher or a load of washing...

i would also not restrict his "duties" around food to just reheating stuff you have prepared in advance - he may not know how to cook now (i haven't read much on this with your DP) - but he can sure as hell learn! even if he just peels vegies for you - those little bits and pieces help HEAPS. i have no drama making DH 6L of food in the slow cooker for him to take to work - but i'm more able to achieve it when he helps peel the vegies...