I am looking for a 2 way key switch to use as part of a 2 way switched
lighting circuit. I can find things like this but that is single way.
Does anyone know of a two way equivalent?

How secure must it be? Most public buildings (i.e. shops/schools) use normal
secret key switches unless security is actually important. Obviously, there
is only one key pattern, but it is fine to stop children playing with the
switches.

You normally see them in grid ranges.

i.e.

http://www.tlc-direct.co.uk/Products/MKK4898.html

So you can assemble a grid switch that has any combination of switches and
indicators that you need.

Christian.