After accidentally earthing the live wire going to the outside light whilst putting a faceplate back on (patched up now), the light has stopped working. I've just been out with a multimeter to see if any power is going to the light at all and discovered something weird.
Here is the connector block for the light. (LTR) Neutral, earth and live. Simple enough.
Here is what I saw after testing between live and neutral:
And here is what I saw when testing earth and neutral:
Unless I have used the multimeter wrong (very possible) it looks like the light has earthed itself after the incident earlier in the circuit. Have I got that right?