The hard part is now done!!!!
Next step is to fit the door sill sensor plug into the door sensor. We struggled with this cause couldn't figure out how to fit the plug as there wasn't enough room. Little did we realise the the door sensor can be taken out of the door!!!
From the inside, give the top of the door sensor a push and the top should start to lean forward. You can then pull the door sensor up and away from the door. Feed the wire for the sill sensor, through the hole, and plug into the door sensor before fitting the door sensor back in place. Remember to put the bottom in first!!!