As usual, everybody goes off on one without understanding how this all works.
Part P is a very simple and unchallengeable legal requirement (and I quote)...
"Reasonable provision shall be made in the design and installation of electrical installations in order to protect persons operating, maintaining or altering the installations from fire or injury."
How you discharge your legal responsibility in this regard is up to you and there are, effectively, two routes to compliance.
The first is open to everybody and requires that you involve LABC. How they choose to assess your "reasonable provision" is largely up to them.
The second method - more convenient for those who regularly carry out electrical work in dwellings - is to join one of several 'competent persons' schemes.
There is no such thing as a Part P qualification.
The so-called five-day-wonder course that gets so many sparks hot and bothered is no such thing. It is a way of attaining the basic minimum paper qualification to satisfy the entry requirements of a competent persons scheme; the scheme operators thereafter must satisfy themselves that you are demonstrably competent and remain so.
That's it. Very little to actually moan about.
Of course, as with many rules, there are those who are ignorant, those who willfully ignore them and very, very many who think they know them and gleefully spread mythology and black propaganda.
My advice?
Get on with it; do what you have to do to make an honest living, always check out the facts and ignore unsubstantiated site rumours.
Oh and - have a happy new year!