My girlfriend bought Joe Wick's SSS plan. From memory the basic principle of the diet is big (big!) portions of meats, greens and fats for meals (including breakfast) and only having carbs (and ditching fats) after working out. Also stay clear of sugar and processed meats. You can simply apply those principles to cheaper own brand food from the supermarket.
For exercise it's mainly circuit training with dumbbells, barbells or kettlebells- pick five exercises and cycle through them 30 seconds on, 30 seconds rest continuously for x number of rounds, usually at least five for 25 minute total. It's recommended to do this at least five times a week, even everyday if you can, since it's short and sharp you won't need many rest days.
You can just make your own programme from those general guidelines and save £147 too!