UK Car Repair Questions? Ask a Mechanic for Answers ASAP
this really sounds like the main battery is discharged / flat to me
So the next step would be to get batttery charger on there and if the battery is more than 3 years old then it may need replacing
thanks for the extra information
in that case this sounds like the security system is preventing a start
this can be tricky to resolve as you need dealer level diagnostics to reset and recode security devices
what can work is resetting the ECU by disconnecting the battery cables and clamping them together for 10 mins.Remove both battery leads from the battery then use a nut and bolt or G-clampto hold both battery lead terminals together.
This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.
This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm
sorry to say that the dealer will have to be involved there's no reset procedure
do you still need help?