Nigel Farage has declared his largest single payment to date for external work, receiving £270,000 for promoting gold bullion. The Reform UK leader disclosed the sum from Direct Bullion in his latest register of financial interests, estimating the work involved around four hours over a three-month period.As a brand ambassador for Direct Bullion, Mr Farage has previously registered several other payments from the company.His recent declarations also show he earned £18,402 for approximately six hours of presenting on GB News.Meanwhile, Mr Farage continues to face scrutiny over a £5 million gift from Thai-based billionaire Christopher Harborne. The Reform leader maintains he was not obliged to declare the gift, asserting it was received before he announced his intention to stand for Parliament in 2024 and was unrelated to politics.Reform UK Leader Nigel Farage's picture is seen endorsing a Gold Bullion firm on the first day of the Reform UK party conference (AFP/Getty)The Clacton MP has given various explanations for the gift, including that it was to pay for his personal security, and that it was a “reward” for campaigning for Brexit throughout his political career.In a recent round of interviews, Mr Farage insisted the gift was a “wholly private matter”, and refused to say if he had spent any of it on security, or on anything else.Last week, he insisted “no one cares” about the money, and when asked by BBC Breakfast how much of the gift he had spent, he said: “It’s none of your business.”“I’m absolutely convinced I’ve done nothing wrong in any way at all,” he said, adding he did not regret failing to declare the donation at the time.The Clacton MP has given various explanations for the £5 million gift, including that it was to pay for his personal security, and that it was a ‘reward’ for campaigning for Brexit throughout his political career.Asked if he had given an interview about the possibility of becoming an MP before accepting the gift, Mr Farage said: “Yeah. And after that I said, after that I said, ‘I will not stand in this election’.“And I was pretty clear when a snap election was called that I wasn’t going to do it. I did change my mind subsequently.”Parliament’s standards commissioner is investigating whether Mr Farage should have registered the gift. If the probe finds he committed a serious breach of parliament’s rules, he could be suspended from the Commons. A suspension of 10 days or more could trigger a recall petition, which could potentially see him forced to fight his Clacton seat again.Reform UK was contacted for comment.