Update.
It didn't work out in that place so I left. It turns out I was lied too, the job itself didn't even really exist. I thought it was fishy on the first day when I was not asked to bring any documents with me to get me registered tax wise, I assumed they'd perhaps forgot and would do as the week went on. Tuesday afternoon I found out they were actually registering us as self-employed, from there I thought "no way I wasn't told any of this".
Man who interviewed me whilst he was a nice chap wasn't straight with me and didn't tell me exactly what the role was. From there my inner warning alarm was going off like mad.
Went in yesterday morning to give it one last chance to convince me it was was worth sticking with. Got there and couldn't even get in the office, you needed a fob to unlock the door and no one was even in the office to let me in at start time. Had to ask the girl downstairs on reception to let me in so I could wait. I waited for about half an hour and a few people skulked in, not managers, and said if no one in charge had even turned in they weren't going to even log on and do anything. From that moment I just decided "this has all been a huge waste of time, it's not even a real job. I'm not an official employee and the people running the place, my supposed superiors, aren't even turning up. I'm out of here." Picked my coat up and just left.
Shame because I was very hopeful but it's a lesson learnt I guess. Demand to know more in interviews about the company and the specifics of your job role because people will deliberately leave things out. Had I known what I came to know in the beginning I wouldn't have wasted a few days of my time.
Back to square one but trying to stay upbeat about it because I don't feel like I've done anything wrong. Not like I flamed out because I was out of my depth and left embarrassed, I left because it wasn't what I was told I'd be signing up for. Just got to find something else, hopefully soon.