M&S are the best imo, although more expensive. My fav is a giant Yorkshire pudding that is filled with either chicken or beef and potatoes, add a bit of veg in and they are a pretty good Sunday lunch.
They also have good deal on 3 for £x, think the pasta dishes are 3 for £7 and they are pretty good quality tbh, I add a bit of Parmesan when heated and job done.
Those yorkshires are ace, proper winter food!
Chicken ones have a couple sausages and some stuffing, too.