Major Electrical Problems - Megane 06 1.5DCI?

Car been working well - got in yesterday to be met with:-
Brake Fault message on dash
Spanner light on
Stop light on
No Interior lights
Boot won't open
Engine won't stop without 5 quick presses on the button
No Heater
No Air Con
No rear window heater

Can someone help please

Mark
December 2010