Electric problems on Range rover

All the functions on the steering wheel and the information panel on the dashboard have stopped working???
over a period of 6 weeks the functions have stopped working but the car still drive perfect
the vehicle is a 2003 Automatic Range Rover Vogue, 3 litre, Diesel, Silver colour, black leather interior, 160,000 Klms

here is some other problems that also occurred

List of electrical items not working: Information panel on dashboard. Controls on steering wheel. Radio/CD player (but the tape player works) Central locking Other items: Passenger air bag warning light always on Sometimes, after the car has been started the hazard warning lights start flashing, when this happens I stop the car, lock it and unlock it again and then it is fine. Sometimes when you switch the dipped headlights on the right one does not work straight away. Sometimes when you switch the lights off the left hand dipped headlight stays on. Sometimes the battery goes flat over night, I disconnect it before I go to bed and then it’s fine.

any help or advice please had the jeep 1 year Faultless before this

Blimey have you dropped it in the bath at any point ?
Could be water ingress in light control module in right foot well and worth checking for water in left side of boot behind panel as well.
First thing to do if possible is to plug it into Range Rover specific diagnostics

Battery drain is well documented but not surprising with all the faults you have but can be headlight wipers not parked or final stage resistor on heater blower also known as hedgehog

As HC says above, diagnostics are a must....also check all connections to the LCM, Rear Amps and Audio Units for signs of water.....

Oh....and it is not a fecking Jeep.....this is a Range Rover.....a Jeep is a cheap heap of s**t made by Americans.