TD4 flashing dash lights on cranking

Please help,
just had the clutch changed on the TD4, dropped off by garage whilst at work.
now on trying to start the car
all i get is all the dash lighs flashing and several clicking noises from the relay and ECU area of engine.
the flashing lights remain even in position 2 of the ignition.
also the temp needle flickers all over the place.
thought it might be a battery issueas it had been standing for about a month before clutch being done, had a full 18hour charge before trying again, still the same problem, tried a different key as well.
all help gratefully recieved

that's a bad earth, probly on the starter motor or on the main earth strap

thankyou, ill check it out

could still be a battery even if you charged it. earth sounds likely though.

finally brought a new battery today and freelander is working again. thankyou for your advice.
i did note on the old battery it had a landrover sticker i woluld presume that this would of been the original battery so it could be 9 years old.
once again thank you