After my replacement, can't say its any better. Hardly done anything on it today.
Time Battery Usage: Standby:
8.30: 94% 43 mins - 2 hours 57
9:01 92% 45 mins - 3hours 30
9:40 82% -- for some reason my usage from now on showed "--"
11:01 80%
13:25 68%
14:37 64%
15:12 59% - apps loaded: Spotify, whatsapp, app store, safari, FB, Photos
16:12 54%
16:25 52% - apps loaded: BBC, Flipboard, Facebook, App store
17:42 48%
18:31 43% - cydia browsing
18:38 41% cydia browsing
19:41 38%
21:00 31%
21:44 22% - 35 min phone call
23:00 12%
Nothing has really been in the MT bar as I've hardly used the phone today (not like browsed the internet or played games on it)
Uninstalled loads of applications, everything which should be disabled is... This is getting stupid now.
EDIT: I let the phone die out of battery and turn off, when it turned back on it was at 5% and within 20 minutes (probably less) it was like 25% battery, that can't be right surely.