Two flat metal removal tools or two ice-lolly sticks/strips of an old cut up credit card will do the trick. There are two slots along the bottom of the H.U for these to slide in to.
Alternately, while searching through my loft over the weekend, I found a stash of my sisters old boy band tapes...E17, Take That, Boy Zone and I think I saw Another Level. Why not keep it and i'll send you these for free