I liked Three. I could travel to EU, USA and Oz and not think about SIMs. They've gone to shit though after saying they wouldn't change, so on principal I will be moving away from them.
I'll check out ID Mobile and Smarty, thanks jellybaby and eskay.
hippy
aggi
Been with 3 over a decade. I lost my roaming last year. Still unlimited everything else for a price no one else matches.