I can't say for certain about the Royal Mint, but the US mint certainly does experience such a load pattern. It responds by either crashing or failing to load,

I can't say for certain about the Royal Mint, but the US mint certainly does experience such a load pattern. It responds by either crashing or failing to load, unfortunately. A lightweight order-taking site that pushes orders to a queue for fulfillment would be a massive improvement over the strategy they actually choose (per-household quantity limits).