* Move signals likely Worldpay IPO in London, maybe thisyear
* Worldpay could be valued at about 6 bln stg -sources
* Rake to stay Barclays deputy chairman until end of year
* Rake played key role in ousting of Barclays CEO last week (Adds confirmation from Worldpay, comment from Barclays,details)
By Steve Slater and Pamela Barbaglia
LONDON, July 15 (Reuters) - British payments processing firmWorldpay took a step nearer a potential 6 billion pound ($9.4billion) stock market listing by appointing Barclays' deputy chairman Michael Rake as its new chairman on Wednesday.
Worldpay is owned by Advent International and Bain Capital,who are looking to list it on the London stock market, possiblylater this year, and the appointment of Rake will help thatprocess, people familiar with the matter said.
The private equity firms bought Worldpay from Royal Bank ofScotland in 2010 for about 2 billion pounds and couldsell it to another investor, but a listing is the preferredoption, two sources said.
Worldpay, which provides the platforms to allow merchants toaccept payments by cards and other methods, would be one ofEurope's biggest listings in years. The estimated 6 billionpound valuation includes debt of about 2 billion, so its marketvalue could be nearer 4 billion pounds, enough to make it intothe FTSE 100 blue-chip share index.
Private equity firms CVC and Hellman & Friedman areconsidering separate bids for Worldpay, sources said. JPMorgan, which was reportedly seen as a bidder, has no plans toenter the fray, two sources said.
Rake has been on Barclays' board for seven years and itsdeputy chairman since July 2012. As its senior independentdirector he was a key figure in the abrupt removal of ChiefExecutive Antony Jenkins last week.
"It became clear to all of us that a new set of skills wererequired for the period ahead," Rake said in a statement when Jenkins left, adding he discussed changing the CEO with othernon-executives.
Barclays said Rake intended to remain as its deputy chairmanand senior independent director until at least the end of 2015.
Rake is also chairman of BT Group, and investorstypically ask people to "comply or explain" if they are chair ofmore than one major company.
Rake is one of the City of London's best-known businessmen.He spent over 30 years with KPMG, where he was chairman of KPMGInternational and is a former president of the Confederation ofBritish Industry and held several other senior roles inbusiness, education and with charities, and advised the primeminister.
He will replace John Allan as Worldpay's chairman. Allan,who is also chairman of retailer Tesco, said in May heintended to step down as Worldpay chairman this year but wouldremain on its board. The firm's chief executive is PhilipJansen.
Worldpay processes about 31 million mobile, online andin-store transactions every day and has about 4,500 staff,mostly in Britain and the United States, its two biggestmarkets.
It made underlying earnings before interest, tax,depreciation and amortisation of 375 million pounds ($586million) last year, up from 346 million in 2013, on revenues of3.7 billion pounds.
($1 = 0.6400 pounds) (Editing by Alexander Smith, Keith Weir and Louise Heavens)