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Their media enquiry contact details are on this page:
https://www.tourofbritain.co.uk/about/contact-us/Your friend is effectively asking to cover their event as a photojournalist, so that seems a sensible place to start.
I presume your friend isn't expecting to get paid. There may be limited official slots for logistical/health and safety reasons but presumably there's nothing to stop your friend lining some good unofficial spots up? Anyone's allowed to take pictures of the race.
I have a professional photographer friend (weddings/lifestyle) who wants to do expand his portfolio. He wants to follow the ToB in a Gruber-esque fashion. Anyone know how/who to speak to...?