New answers tagged server
Yes you could do this, but it's not a good idea. Ignoring the security aspect, there will be a delay of at least 100-150ms when fetching cached content (the latency between your UK and US servers). This is an eternity in page generation terms.
Yes, this can be done. Although you will have to make sure that the daemon is setup to accept external connections. Be sure to take a look at this question on authentication /w an external Memcached server. Delay can depend on a number of factors - Although, as William David Edwards pointed out, closer is better.
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