General Scam Warning - +4470 Redirect Numbers
UK Numbers with an area code of 70 are Personal Redirect Numbers that can be redirected to a number anywhere in the world. There is no real legitimate reason for a UK based business or individual to have such a number. If anyone gives you a number that starts '+4470', then it can be almost guaranteed you are dealing with a scammer of some sort.
NOTE: Scammers will often try to disguise the number with spacing, '-', '()' or similar, so look at the actual digits.