The Champions League cloud that casts a long, dark shadow

[BBC]More than a year on from one of their most embarrassing European exits, Celtic arestruggling to escape from a groundhog day entirely of their own making.Amid buzz phrases like "learning lessons" and "wake-up calls" following last weekend's derby drubbing at Ibrox, an interesting yet awkward question emerges:have Celtic learned anything at all from last year's costly mistakes?Going out of the Champions League to Kairat Almaty cast a cloud over huge swathes of last season.Celtic only emerged