One of our 3 old "heritage sites" is indeed https://taxfreegold.co.uk/
I still use it to check some facts.
It was created in December 1999, and was never designed for use on mobile phones. To upgrade it would almost certainly require a complete re-write.
Our new site was designed to work on mobile devices, and it uses one shopping basket, whereas our old sites needed one for each, which was inconvenient for customers. They also had no search facility (or at least not worth using), but used old fashioned hard-coded links and navigation, which still work well for anyone capable of thinking logically, but usually require more clicks.
I do occasionally view websites on my mobile phone, but I dislike the experience.
You have just given me an idea though: We should add some "free postage" pages to our old websites!
Easier? Sure. Buying via Amazon is often easier, but when you realise that merchants are typically paying Amazon about 15% commission on their sales, then I would always check elsewhere unless is was a very small purchase.
Atkinsons? I guess that you can hardly notice the poor quality of their photos when using a mobile phone. Even on a large desktop monitor, it can be difficult to tell which of the coins are genuine, and which are fake.
Newbies have a lot to learn!
😎