2 PIR's in a 2 way switch formation

Can anyone advise how to wire two external PIR's in a way that either one will switch on a light?

Thanks

Connect both PIR's in parallel to the same light; ie from supply to PIR 1 to fitting & from supply to PIR2 to same fitting.

Yes, but it's not 2-way in the sense of a 2-way switch. It's just 2 passives wired in parallel connected to the same switched output.

Imagine you have a twin & earth cable leaving the switched side of a fused spur.

This would then feed the passive, and the switched feed would run to the light fitting.

Any additional passives would be wired in exactly the same manner.

In practice, what I do is put a fused switched spur adjacent to a 1G1W switch.

The live feed from the spur goes to common. Then I take a three-core and earth outside.

One core is the switch (output) of the passive. This connects to L1 of the switch. This switch is now an override switch where the off position is auto (sensor operation), and the on position is permanently on.

The other two cores are live & neutral feed, the neutral being connected together with the neutral from the spur inside the 1G1W switch box.

The three core and earth now runs round to the passive (s), connecting each of the cores (live, neutral & switchwire) to their respective terminals.

At each passive, you can come off with a twin and earth to feed the light fitting. The live connection for this is the switchwire (output) of the passive, not the live feed.