Hello Kynox,
I'm a little confused, because there is no patch-locale-enGB.MPQ. What exactly do you mean? The Spell.dbc from locale-enGB.MPQ is outdated and shouldn't be loaded.
Also, I just realized, my Spell.patch isn't going to be able to patch your Spell.dbc, since your number of columns differs. Could you send me your patch-enUS-2.MPQ (assuming you're from the United States here)?
Thanks in advance.