Why won't my 2021 LDV Deliver 9 turn over or start?

The simplest cause of a problem like this is the little sensor that `knows’ when the gear selector is in park. If the sensor fails or is maladjusted, it can’t tell the computer that the vehicle is in park (or neutral) at which point the computer won’t allow the engine to start.

However, before you start replacing bits and pieces, consider that this is a pretty obvious warranty job and LDV is obliged to fix it at no cost to you. Provided you have had the vehicle serviced properly and haven’t exceeded 130,000km, LDV’s responsibilities are quite clear.