Some professional advice...
The first problem with Intellectual Property Rights legislation is that nobody enforces it. If someone copies your product you have the expense of taking them to court for damages. If they are in another country you can imagine how expensive this would be. The authorities in either country would not be interested in helping you with your case. In terms of whether you would win your case, there's plenty of precedents that the party with the most expensive lawyers wins. BMW took a Chinese car company to court in China for blatantly copying an X5. They lost.
The second problem is there are many schemes and companies who will want to sell you some protection. The problem with your copyright time-stamped certificate is that, if it is part of the IP legislative framework, and I'm not sure it is, it might stop someone copying it. However they just have to change a few details and they won't be copying it. Where did you get the certificate from?
Three-dimensional products are covered by Patents if they are inventions, or Registered Design if they are simply certain designs of something generic, like a table lamp. There's a UK organisation called ACID, Anti-Copying in Design, that will organise the collation of your design materials and add them to their database. They'll also advise on IPR legalities. Displaying the ACID logo on your product might put people off from copying it, but if it doesn't you're still left with the legal process of taking them to court at your own expense. There's also something called a Design Right but it only covers the shape and configuration of something, so is easy to get around.
Thirdly, as you have invented something it's really the Patent system that is the only one that would offer you protection. Contrary to a previous post, your invention is protected from the moment you apply for a patent. Applying for a patent is free in the first instance, if you do it yourself. The yearly costs ramp up the longer you keep it in force, as the authorities assume that you start making money from it. The application requires a certain amount of writing and drawing skill to encapsulate the invention. There are many, many companies who will offer to handle the application for you for £2-3,000 probably. However, if you sell a £200 product and make £100 off each one and sell 30 in the first year that's all your profit gone. That's about the same time the copies will hit the market too!
Everything you need to know about IPR is here...
https://www.gov.uk/intellectual-property-an-overview
There's a chapter on IPR for designers in this book...
https://www.amazon.co.uk/Design-Students-Handbook-Essential-Context/dp/1408220288
Finally, I wouldn't bother with IPR protection. Save all that time and money. Get it to market quick. Blitz all the owners club forums and sell a pile of them before the cheap copies start coming out and before UKGSers with a welder start making their own.
Steve.