Hi Karen,
Check out the food section of the forum for some ideas. There are no rules as such as to what you can and can't eat, but it would be wise to avoid things like sweets, cakes etc. As Andy is type 2 and on oral medication, the foods that I can tolereate may well be different to his, so the only way of truely knowing is by testing his blood glucose 1, 2 and 4 hours after eating to determine what impact those carbs have on his bg's. Some of us find that a small reduction is sufficient enough to maintain good control, so portion control is a useful tool. Therefore, should he wish to continue to eat potato's, pasta and rice, eat these in smaller amounts and substitute with plenty of fresh vegtables on the plate, but do remember to test afterwards.
Try to read up on the gi/gl index diets, this can be very benificial in helping diabetes control, it may also be helpful to buy a good carb counting book too. As always, if you are concerned at all about what impact eating certain foods may have on his health due to past or present conditions, do seek medical/dietary advice from a professional first before making any radical changes.
Good luck!
Nigel