Is Synchronised viewing possible? (showing what a VR viewer is looking at on a Screen)

I want to make a VR scene which is viewable in a viewer, but I would also like to have a large TV show what the viewer is looking at, is this possible in PlayCanvas? are there tutorials or samples which show this?

ideally I would want the Scene be shown on a Mobile device, and also on a Laptop, so there will be some netcode needed, any push in the right direction would be great.

Sounds like you need to create multiplayer capabilities to your app, and synchronize viewing between devices.

Check out tutorials and user manual.
Tutorial on networking might be useful.