The primary function of a notary public is the certification or authentication of documents and signatures. In many circumstances a solicitor can perform this task but occasionally an overseas authority may insist that a document is signed by a notary public rather than a solicitor. If your document clearly states that it must be signed or witnessed by a notary public then you must follow this instruction. This is seen on some powers of attorneys that are provided from solicitors outside the UK. If your document needs a basic certification then a solicitor should be able to provide this service. Here is a sample picture of UK degree with solicitor's seal and signature for your reference https://www.topdiplomaservice.com/SAMPLES/Buy_other_certificate/2019/040...