From what I can make out, notification requirements for outside and kitchens are changing slightly. Ie there is no need to notify if you are not changing the characteristics of the circuit. Basically things like replacing a socket front like for like or similar. Heating controls are all notifiable still as far as I'm aware, and a new circuit or alteration to an existing circuit ie taking a spur off a ring final etc would still be notifiable.
The problem comes from being able to join a cps after April. If you need a level 3 nvq then part p full or defined will not enable you to join, neither will 17th edition or even 2391 test and inspection!
I'm debating whether its worth coughing up for a cps now and paying for it even though I will rarely use it, or completing the nvq 3 course and holding on to my scheme money until required.
As for part P courses, you'll pass it but you might not learn everything you should in such a short course. As already you might be better off with a basic electrics course to get you going, if your keen then start reading up on line (electriciansforum is good if you can take some banter/abuse from the time served) and hold on to your part p money for a minute.