corner and perimeter gap - Tile Advice

[serval]

what is the recommended gap that should be left between the tiles that meet at internal corners on the walls?

Also what gap should be left around the floor perimeter. Perimeter gap would be covered by the bottom wall tile.

tiles are 12mm thick porcelain. 1200X600

 

[Dave]

I leave a couple mm on walls and around 5mm on floors if the walls are tiled in bathrooms. Larger floor areas i leave 10mm so the skirting covers ok.