Refer to the input text as context and select the correct relationship between 'Worldpay' and 'London' from the available options.
Options: founded by, parent organization, original broadcaster, headquarters location

British payments processor Worldpay joined the London Stock Exchange on Tuesday in an initial public offering valuing the company at 4.8 billion pounds ($7.4 billion), the biggest flotation in what had been a lacklustre year for listings in Britain.
headquarters location