Worldpay Group, the payment processing firm, has handed the London flotation market a hefty confidence boost after pricing the UK's biggest initial public offering since Glencore in 2011 and the biggest private equity-backed IPO ever in the country.

The 240p-per-share price gives the British company, which is owned by US private equity firms Advent International and Bain Capital, a market capitalisation of £4.8 billion, according to its statement on October 13.