https://www.artofmanliness.com/articles/so-you-want-my-job-luthier-guitar-maker/
Especially for you Ricky
If you want the certificate to prove that you are an artisan baker/ rocket scientist/ Chief Inspector of Her Majesty's Constabulary/ luthier, I can provided this for £10 plus p&p
@fleabag was more than happy with his police certificate