In the UK, all doctors must complete the 2-year foundation programme and provide evidence of their foundation programme competencies prior to applying to specialty training. Once a candidate has successfully gained a place on a specialty training programme (through competitive selection), they are awarded a National Training Number. Traditionally, all doctors must have an NTN in order to achieve a certificate of completion of training (CCT) and therefore entry to the GMC specialist register and apply for a consultant job.
If you are an international doctor, there are alternative routes to enter specialty training or gain entry to the specialist register. Our friends at Road to UK have written comprehensive guides to the process for medicine, surgery, emergency medicine, GP and Obs & Gynae.
You will have to create a free account with Road to UK to see these articles, but you will find so much helpful information on their website about moving to the UK to start an NHS job, we recommend joining their community anyway.