VAT no is not required now. if you cross over 5lack sales in a year , then you are required to obtain one. But for starting and i think you do not have offline store. So, there is no problem as of now to start. But once you take it seriously to sell, then it is recommended to have VAT registered.
keep listing on ebay with you VAT as of now. see how it goes and decide later( whether you take it as full time or part time) For part time seller with less than 5lack turnover, VAT is not required.
Hope this helps.