http://www.brightbox.co.uk I asked them about their policies regarding plans to ...

http://www.brightbox.co.uk

I asked them about their policies regarding plans to expand to the US or hold any US interests, and also specifically asked about a mention in their policy documents on defamatory content (as I deal with user generated content) and received this good response:

    we're based in the UK, both co-founders are UK residents and we have no plans to
    become a US company. All our datacentres are in the UK, and expansion plans are
    for the EU only.

    We believe strongly in data protection and obey all the relevant laws. I agree
    that ISPs really *should* be considered "mere conduits" but unfortunately there
    is legal precedent that means we can be held responsible for defamatory content
    if we're notified and do nothing about it.

    Usually, solicitors for the allegedly defamed contacts both us and our customer.
    If our customer is unresponsive or uncooperative and the alleged defamation
    continues, then we get held responsible.

    So our AUP considers defamation abuse to enable us to take action to protect
    ourselves if we have to. The only other option available to us would be to have
    customers indemnify us against any legal action (most likely in the form of
    a large deposit :).

    But we're not interested in suspending accounts or servers any time a
    solicitor writes to us. If you deal with the reports in a timely fashion (usually
    within 48 hours) then you shouldn't expect any problems.

    And for what it's worth, we've never actually had to suspend anyone for this
    (though we've come close enough to feel the need to put it in our AUP).

I also plan to utilise Jump Networks: http://www.jump.net.uk/ which is about as close to http://prgmr.com/san-jose-co-location.html as you're going to find in London. Remember... if you're going CoLo it's all about power consumption.

Finally, other sites I checked out included http://www.cloudsigma.com/ and http://www.prometeus.net/sito/