There is a Report button on every listing. All eBay will give you is a polite note thanking you for helping police the site. They encourage policing but don't want to encourage vigilantes.
This doesn't mean they do nothing. If you put some of those items on your Watch List, you may find the sellers suddenly become "Not A Registered User". Which means eBay shut them down.
The market for silver (and gold)is international. Indian manufacturers pay the same for silver as Canadians. So a 99 cent item is obviously not going to be sterling-- no matter how low the manufacturer's labour costs are.
Start Searching with "Highest Price and Shipping First". It is easier to drill down through a hundred items to your price point, than to wade through thousands of fake and misdescribed low priced items.