Demon's souls come with a walk through in the box, but I would ignore it, more fun to learn by yourself. Also note magic is broken good, Soul arrow makes the entire game a joke and one class has it at the start of the game.
Nocturne was hard, but that's Shin Megami Tensei, if it's not slapping you around, then you're doing something wrong. I really enjoyed Strange Journey, it is old school (SMT1 and 2) style, but much more forgiving than Nocturne was. Not sure if it got a UK release but your DS will play American games and I know Movietyme is good for importing games.
Why play Zelda, when you can play Zelda as a Zebra/Hamster/Walrus/Naked child/Naked zebra/Cupboard/Ghost/Football/Ray Peacock/Ed Gamble/Power ranger/Hedgehog/Plumber/Frog/Nazi/Jew/Spaceman/Gordon Freeman/Robot/Indian/Cowboy/Donkey/Bottle/Cup/Ferret/Brick/Tree/Zebra in a tree/Chicken?
Bayonetta is just another Devil May Cry game for all purposes. I like to use it as an idiot checker. If someone goes "She is so hot, I want to do her, she's so sexy", they are an idiot. If they get it's all tounge in cheek and seaside humour, then they're usually going to enjoy the game and not just wank over it and whine about difficulty.