American Express has launched a limited-time promotion for its Gold and Platinum cards, offering new Gold cardholders 30,000 bonus Membership Rewards points after spending £3,000 in the first three months, while new Platinum cardholders can earn 80,000 points with a £10,000 spend in six months. Both offers are valid for applications approved by May 27, with the Gold card free for the first year and a £195 annual fee thereafter, and the Platinum card carrying a £650 fee. Additionally, referral bonuses have been increased for both cards until the same date.