ebay tax

having been selling a few items over the year on ebay uk not old used items, i ahve been told by ebay i have sold either over 30 items or reached the threshold for tax .maybe just reached.anyway ebay is asking me to click the approprate tax office on there thread they five you.as i registered with ebay uk but i live in spain and sold from my spanish adddress do i go through the uk or spanish authorities.thanks

Hi flora,
Please have a look at the guidance here:
Selling online and paying taxes - information sheet
If you are selling as a trade but resident in Spain, then you would need to consider your tax implications in Spain.
The profits from trading would not be taxable in the UK.
Thank you.