Just need to sign up or add these codes to your existing account (if you haven't done so already).
Working codes
5ABCSHOP : 5 weeks
ABC1034 : 4 weeks
ABC4Eggs : 4 weeks
ABC88EGG : 4 weeks
ABCSHOP5 : 3 weeks
UKJ23TVW : 3 weeks
UKJ23HAW : 3 weeks
Expired Codes
LEH98TAR : 1 week = Exp
WRG27AMA : 1 week = Exp
BUK53HSM : 1 week = Exp
PAR65RAW : 1 week = Exp
BND45WHS : 1 week = Exp
RYD85CSE : 1 week = Exp
ABC85SCH : 2 weeks = Exp
CCP21BCC : 3 weeks = Exp
CCP21BCC : 3 weeks = Exp
USC99UST : 3 weeks = Exp
CCP25EDT : 3 weeks = Exp
USH44SER : 3 weeks = Exp
RAK40USA : 2 weeks = Exp
WEB89EGG : 2 weeks = Exp
CCF22JPM : 2 weeks = Exp
AWA72YTM : 2 weeks = Exp
AUS88PST : 2 weeks = Exp
FRS26WXC : 1 week = Exp
KLW99SAT : 1 week = Exp
Thanks to the comments below for the new codes.
I got my subscription from 19/01/2012 to 27/02/2013
Update: Some codes have expired.
Wow, I'm not even sure how much I've gained overall now. I've got 520 days in the bank. It can't keep going like this can it?
I did look at abc eggs a month or so before this mega trial started but wasn't sure my son would be onto it. Well it turns out he is! So when they get on top of these trials I'll definitely be subscribing, plus his little sister will be approaching a reading age in a year or two.