If it hasn’t aired on terrestrial, it’s a spoiler. That is the one simple rule to follow. The only exception is, if you are taking part in a rewatch, at any pace, you do not discuss anything past that ep.
This board, just like the beeb boards, is primarily set at a UK terrestrial pace. So unless it’s a rewatch (which can be at any pace, but nothing is discussed beyond that episode) There should be no Spoilery in any thread that clearly isn’t marked!
To mark a thread which contains spoilers, you simply put the word “Spoilers” in the topic title and also in a noticeable text at the beginning and end of your post. Please lets be considerate to those who don’t download or have Sky :)
All mods have the right to take down your posts if they think they are spoilery :)