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I take it you have checked the boot light isn't lit.
The best way to find out is to disconnect the positive lead from the battery - connect a multi-meter set at its voltage range between the positive lead and battery - then start removing each fuse in turn. Whilst there is no guarantee it will pinpoint the problem it may should reduce the number of possibilities.
It may also be wise to have the battery load tested and the ouput of the alternator checked - most decent battery suppliers will do such tests for free in the hope of gaining a sale
If you are going to do this, your meter needs to be set on the CURRENT range, not VOLTAGE.
Pos lead of meter to battery pos terminal and neg lead of meter your now disconnected feed. Start on a high range (10A) and work down until you can read the current draw. DO NOT try to start the car as you will kill your meter!!
Currently in martin999's garage:
2011 (11) VW Passat 2.0 TDi SE + options in Island Grey, 2011 (11) Honda CB1000R in Pearl Cool White... oh and a 2004 (54) Secnic II 1.5dCi Dynamique in Ottoman Blue !