Should I add my small business to UCAS

Is the business related to the degree you will be applying for in anyway?

That’s beside the point. Paid employment must be listed.

Is the business related to the degree you will be applying for in anyway?

Is it paid employment? If so then it must be listed.

not really i’m applying for psychology

I’m currently on my gap year and I am applying to university for next year, at the moment I have an Etsy shop that I run independently, is it worth putting this down under employment on UCAS or not?

I would put it down and also touch upon it in your personal statement and stress time management, multi tasking and organisational skills - its what Unis look for as well as the reason why you want to study the course in the first place.

For a psychology PS it's really not that helpful to use space talking about those sorts of skills - it's an academic degree they're interested in academic interests (and can judge for themselves time management, multi tasking and organisational skills by looking at the education and employment sections....there's no need to waste space in a PS pointing out obvious information provided elsewhere in an application)

In a personal statement - spending a line or two highlighting real evidence of these skills - that the vast majority of applicants will lack - is a good use of space. If you can't convince a university that an "academic" degree is for you in 45 lines then I doubt the extra 2 lines spent on your business would cost you a place.