If you are disqualified while you hold a P1 provisional licence, and you do not or are not eligible to appeal, you will need to serve the disqualification period and then:
re-apply for a learner's permit (you won’t need to pass the theory test but you will have to complete all the documents and pay the fee again)
pass a practical driving test again (either the vehicle-on-road test or competency-based-training) before being reissued with another P1 licence.
You’ll need to hold the P1 provisional licence for a minimum period of two years before you can progress to a P2 provisional licence.