UK's largest electronic payment processing company agrees £7.7bn offer just a day after news of takeover talks emerged Worldpay, the UK's largest electronic payment processing group, has agreed to a takeover by US rival Vantiv that values the British group at £7.7bn. The cash and shares offer makes Worldpay the latest UK company to be snapped up by a foreign buyer after the Brexit vote, which triggered a sharp fall in the value of the pound.