From the old style compo and ten man packs, my favourites were: tinned sausages; bacon grill, tinned jam, and I also liked the 'cheese possesed' too
I used to always look forward to opening the rolo's, just in case I ever found a packet where the foil was NOT stuck to the rolo's.
The latest packs are really good, and my new favourite (apart from the lovely packs of nuts etc) is the muesli in a pouch, which I find very refreshing.
Boil in the bag favourites are: spicy rigatoni; bacon and beans and steak veg and potatoes.
I have always liked the boiled sweets, and they are even better now that they actually come out of their wrappers without a fight, and the pale green one is just yummy.