Worldpay heads for listing after picking Barclays' Rake as chairman - sources

By Steve Slater and Pamela Barbaglia LONDON (Reuters) - British payments processing firm Worldpay is set to take a step nearer a stock market listing by appointing Barclays' deputy chairman Michael Rake as its new chairman on Wednesday, people familiar with the matter said. Worldpay is owned by Advent International and Bain Capital, who are looking to list it on the London stock market with a valuation of about 6 billion pounds, possibly later this year, sources said. The private equity fir