LED indicator - How to show 'on' when circuit is open
I have carried out some breadboard tests and find that bridging the switch with an LED and 780ohm resistor does not work properly enough to be reliant. The LED lights when the switch is open but the coil is energised too as suggested by @Spehropefhany meaning the relay switches intermittently. With the switch closed the relay is energised and the LED goes out.

Not quite the effect I was looking for. I consider the only way to do this properly is to use a separate bi-pole low current relay for the LED only - connected to GND after the limit switch - so the LED is on when the switch is open and off when the switch is closed.