I'm going to be doing some extra work in my spare time, on a self employed basis.
It won't be for huge sums of money and due to the nature of the work it's a bit sporadic. It also isn't in the same line of business as my main job.
Now the question is do I put my earnings in a separate bank account or just put it straight in to my normal current account, payment will be made via bacs if it makes any difference.

Don't think it matters.

What does matter is keeping a record of the earnings so you can work out what tax to pay.

Why is this the question?