The very last stage, after you complete SQE2 is to produce a criminal record and conduct check. This is done through the Disclosure and Barring Service (DBS). This is organised by a company called Atlantic Data, on behalf of the SRA. They check not only the criminal record but also whether you have been bankrupt, and any county court judgements against you. They also have a process for verifying your identity, which is undertaken by an independent solicitor.
You will need to prove that you have done your degree, so you will need your degree certificate. You will also need to prove that you have done your qualifying work experience. So your two years of qualifying work experience will need to have been signed off by a solicitor. With this sign off, you can apply for admission as a solicitor. Once you have been admitted as a solicitor to the roll, then you can apply for a practising certificate. Before you start practising as a solicitor, you will need to have professional indemnity insurance in place as well.