sometimes, he’s “Lord Renfrew”
The full list of titles is “His Royal Highness The Prince Charles Philip Arthur George, Prince of Wales, Duke of Cornwall, Duke of Rothesay, Earl of Carrick, Earl of Chester, Baron of Renfrew, Lord of the Isles, Prince and Great Steward of Scotland, Royal Knight Companion of the Most Noble Order of the Garter, Extra Knight of the Most Ancient and Most Noble Order of the Thistle, Grand Master and Principal Knight Grand Cross of the Most Honourable Order of the Bath, Member of the Order of Merit, Knight of the Order of Australia, Companion of the Queen’s Service Order, Member of Her Majesty’s Most Honourable Privy Council, Aide-de-Camp to Her Majesty.”
Lots to choose from. More “Scottish” ones than “English” ones. But that may be because the Scottish kings gave more to their eldest sons.