Ignore the above, After lots of tea and scrap paper, I realized that my equation for the voltage around the loop was wrong and also due to some rounding and conversion errors, other values were also incorrect.
I've now sussed it out and submitted it so just waiting for it to be marked.
Please bare with me, this is my first post here (although I've read a lot on here over the past few months)
Hopefully I've used the correct formatting etc.
I've got to a sticking point on the final point of the question below (2iii) I'm pretty happy with my answers to 2i and 2ii so I've not...