Bit of an update on this.
Handed my noticed in, boss talked me out of it promising massive payrise when the company starts making money.
Fast forward to pay review this July. Letter states company not making money at the moment, but showing signs of potential blah blah blah, looking for another review in January.
Boss grabbed me thanking me for the work I have done since January, told him im pretty hacked off as a rise was promised. He said I will be the first one to get sorted out as soon as the company can do it.
Had a chance conversation with an ex employee. Ended with an interview for a permanent role, not in my skill remit. Interview went super well. But didnt get the job. I didnt let it rest, and have now secured a 6 month contract thats doubling my monthly take home pay. Intention is the try and get me upto speed and see about offering me a staff job.
Over the moon is an understatment. Current boss said its not sunk in yet.