Defender 110 td5 problem

Hi I was driving down the road and all of a sudden my Land Rover come to a stop the temperature gage when to the red and now nothing doesn’t turn over power going to the ignition but not turning over no glow pug light now battery light but still reading in the red on the temperature gage and sagestions

Lift the drivers side seatbox panel and have a wiggle of the blue block connector and everything else if you want. Google td5 blue header joint