A seller has sold me dangerous goods.
This is not uncommon. Buying on eBay isn't like buying from the shops. eBay even warns buyers in the user agreement that that they do not guarantee the quality of items sold here, that they will be safe, legal (or even exist) or that descriptions will be truthful or accurate. eBay is a jungle.
These risks are particularly high when buying items from abroad - especially China, where items often don't comply with UK safety standards.
As for your seller's registered business address (in China) you can find this by scrolling down in any of their listings to "seller contact information".
Your seller has a UK distribution base in Northampton, but bringing legal proceedings is likely to be pointless if they have no legal entityin the UK. Take legal advice if considering this.
If you say they are selling dangerous items you could still report this to the Trading Standards office for Northampton. Even if they have no power of prosecution, TSOs may still have power of entry , inspection and in some cases seizure of hazardous materials. As an enforcing authority they can also contact eBay for information.
