Need to run some network cable outside the house from room to room, cant do it inside as i will have to lift floor boards and dont want to tack along the skirting. What type of cable do i need, its going to be about a 30 meter run point to point.

You could run it through some tubular electrical conduit, the same type used in house wiring.
Powerline kits could help you out
get the cable from room to room while only using a few meters of cable. No drills, no cable tidy, no hassle
Why would he need to bury it?? Just cable clip it to the wall.
I used standard Cat5e 10 years ago and it's still fine but exterior grade is better if you can get it.
Just remember that at some point it will need replacing so don;t route it anywhere that will be a problem in future.
) and never had any problems. The run was put in 8-9 years ago.I used standard Cat5e 10 years ago and it's still fine
. That i did run in some pipe