Hmm, yes; I went back and re-read Mappers' posts to make sure I understood properly. She doesn't mention the BON, just firing and writing up. Now, I'm not sure what is classified as "writing up". Here, if you are suspected of a disciplinary infraction, you will be required to face a hearing at which you have the right to be defended by a Union representative, or a lawyer should you so wish (and if the infraction is serious enough). If found guilty, you may be presented with a written warning. Normally, if you have received 3 such written warnings within a specified time frame, it may be grounds for suspension pending firing, but this happens very rarely. Is this what you call "writing up"? Of course, if it is very serious - and appears on the list of "firing" offences - you may be given notice, but you always have the right to appeal. If it is something which may be reported to our SANC (equivalent to your BON), you may be suspended pending an official investigation. Your future will then depend on the Council's decision.
On the other hand, if you have made a mistake which does not impact negatively on the patient, or which does not have lasting repercussions, you may merely be required to write an "incident report". In fact, this is almost always the jumping off point for potential reprimands and/or disciplinaries. These are also used in cases where drs have possibly acted incorrectly, have been rude to staff, where patients have injured themselves or injuries on duty. They are not only used against you, but can also protect you. CYA.
So which category does "writing up" fall into? As for firing, I am forever reading in AN about what appear to be trumped up cases, even some involving hate campaigns by staff cliques against Newbies or people of different race groups. If any person can get away with arbitrary firing of another without cast-iron grounds, regardless of the profession, then either the victims need to educated regarding their rights under your labor law, or you need to take a close look at your labor law, to see if such practices really can take place. The law is supposed to protect the worker as much as it is supposed to protect the employer.