That email clearly was being sent out to people all over the world (probably with those in the USA actually being targeted), as there are no UK phone numbers beginning with an 8.
With the exception of the 999 emergency number and various 'official' services (such as 111, 112, 119, etc), all UK phone numbers begin with a 0. So nobody in the UK is likely to get caught out by the scam, as all they'll get when they try that number is an 'unobtainable' message or tone.