By Chris Dorrell Fintech firm Plus500 said its expansion plans were paying off after reporting an increase in client numbers and higher revenue. Revenue increased by 11 per cent to $187.3m (£144.5m) in the three months to September, as the trading platform’s push into new markets helped bring in more cash. The number of new customers rose by 21 per cent year-on-year, it said. Plus500 said its continued push into the US market was progressing well on both the institutional and retail side. The firm also said it will look to expand its presence in the UAE, where it obtained a regulatory licence …