Outdoor pir light wiring and what wire goes where?

[PILLBOX]

I have replaced my pir outside light, my problem is the wiring on the new light it blue and brown into a junction box, wiring from the house is grey black and brown with an earth.
Which wire goes were?
Many thanks

[Mr White]

I presume you did not take a note of how the previous light was connected?
If this is so, since I was not there, there is no way I (or anyone else) can know how it was connected, therefore it should be tested to determine what is what.

So you will need to get a competent person to do the job for you.