noisy gear change

hello all when i go from 1st to 2nd i have a bad grinding noise doesnt happen all the time but is quite often my other gears are fine had it to seat for last service told them and they said couldnt find enything wrong but is still happening due another service now will fetch it up again any ideas everyone cheers

cheers mate dont think its my driving lol it happens to my lass as well it happens when am driving slowly too cheers for reply