Circle is an exchange services company using Bitcoin’s technology to transform the way consumers pay for things by developing cheap, secure, and easy ways for people to transfer money. Circle is offering new mobile apps for consumers to facilitate...
Read more:
http://www.newsbtc.com/2015/10/01/circle-is-preparing-their-european-market-entry-london-is-the-first-goal/
London would be the automatic first choice for entry, given its position as the finance capital of Europe.
They will have to navigate through regulatory hurdles for each country, in Europe. Won't be easy.