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Ignore the first bit +44 and search like this xxx-xxxx-xxxx
That might work for a London number. Drop the +44 and add a zero like so ...
If the number is +44 xxx xxxxxx use 0xxx xxxxxx
or if the number is +44 (0)xxx xxxxxx use 0xxx xxxxxx
Note that in the UK, we don't usually put dashes in phone numbers.
See how they answer, if they say who they are; appologise and say that you've got the wrong number.
If they don't announce themselves, say "Hi, could I speak with [make up some name]". There is a slim chance that they will say who they are when saying that the made up name doesn't exist at that number.
That's what i'd do.