I find that it is a rather odd book tbh. There are a few recipes where I truly wonder "why on earth", eg shepherds pie with the tinned mince and frozen potato (why not go the whole hog?), or fish soup which starts from a tin of ready made fish soup(!) or avocado and prawns (take one avocado and add Tesco Finest prawn cocktail).
However you can get past these to some other workable recipes but she has overstated named ingredients - I don't want to be told which brand of mayonnaise to use etc. And in these recipes her main cheats are buying ready chopped items, so not really something sensational - if you were so inclined to spend your money then you probably already did this. And as someone who has used lazy garlic/ginger etc for some time, i don't think that you need specific recipes for how to cheat using such ingredients.
Personally I rate Nigella's Cheat book far more highly. In there there are recipes where you can put something good together with very little effort. Delia's recipes either are too close to simply trying to liven up processed food, or are just rather random, and I'm not sure that they are really "cheating". I can see why supermarkets would be excited about it, but I really don't rate it at all.