UPDATE:

Despite a new agreement reached in February 2016 (https://europa.eu/rapid/press-release_IP-16-216_en.htm) the subsequent vote to leave the EU in the June referendum will still require decisions to be made on where your data actually resides. Many major cloud companies will probably open UK based data centres to meet the issues raised by Brexit, but we have always maintained our data in the UK and unless required by our customers will not under any circumstances move it to a data centre outside the UK.

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UK companies are moving away from US Hosting providers after EU-US data transfer agreement known as Safe Harbour is outlawed. Following the recent EU decision about safe harbour, US cloud providers are no longer compliant with European data privacy rules.