As it says on her profile @Kevin-Or-Kev0 Paula is a Community Manager for this community.
Its always difficult to set up a cohosting business when you have no experience as a host. Understandably most hosts want to work with highly experienced cohosts with great reviews and ratings .
i would say start by renting a room build up some great reviews and ratings . Learn how the STR platforms work, understand supply and demands and legal requirements for STRs in the Uk.
Then you will be in a position to start marketing yourself as a cohost .
i am a UK host with nine years experience and four years experience as a cohost .