I have four interviews for work lined up and need to get to the UK ASAP but am not sure if it is allowed to enter with only a one way ticket. I am a british citizen and is in possesion of my British passport.
Can I return to the UK? ... I am a British Citizen
Having right of abode means you’re allowed to live or work in the UK without any immigration restrictions, which means:
you won’t need a visa to come to the UK
there’s no limit on the length of time you can spend in the country
All British citizens automatically have right of abode in the UK.
So, you don't need a ticket for a later flight out of the UK.
I've entered the UK many times without such a ticket.
You write that you are a British Citizen. This is different from a British Subject, a British Overseas Citizen and several other types of British national.