Thank you for the info!!
I wasn't thinking of it in an 'avoiding responsibility' or 'how to get away with negligence' point of view - only whether there were any major reasons to go one way or the other - and as Jon points out, it turns out that the reasons are largely tax related.
However, it is good to go through the 'what if' scenarios, incase I find myself on the wrong end of a negligence claim or similar. While I don't intend for this to happen, and will train/practice to make sure it doesn't - you just never know do you!!
It seems that Sole Trader is the way to go (at least initially), as the intention is to start small (and probably stay that way
), but I've always got the option of change to a Ltd company if it becomes wildly successful (and buy a BMW 530