Just thought I would give an update . Decided to take a look at the Air Suspension ECU in passenger footwell . On taking sill too cover up and LH kick panel I discovered the entire depth of the recess ( about 2inches) was full of water ! And the wiring harness was sat in this . Some damp had got onto the ECU and it had condensation inside . Took it apart , dried it out and reconnected . Got rid of all the water I could see and dried as well as I could . Ignition key in , activated steering lock , ignition on , steering wheel came out to meet me , and Air suspension led s lit up .. tried central locking , and once more the flashers came on when locked and unlocked . Problem located !! Now I just have to find where water came in !!
Thanks to all those who posted suggestions and information !