Elusive visitor - Best way to attract

Hey folks,

I've recently started setting up a feeding station with some help from this forum and it's already starting to get a lot of attention from 'the regulars' - Blue Tits, Robins, Collared Doves and Blackbirds. One bird I hear fairly often but have never seen is (at least one) Wren which lives somewhere nearby.

Is there a 'best way' to bring this eluvise songster in? Or is it just patience and chance?

Cheers