A head scratcher about property releases

[JamesUK]

Hi all, so I've got these photos I've uploaded to Alamy but the whole thing of property releases with these pictures is proving to be a bit of a head scratcher. I have read up on it so I know certain photos just straight up need property releases if I don't want just a rights managed license but others I'm unsure about...

First off there's these two which I took in a field I was passing through but I honestly cannot remember exactly where they were taken and I don't think anyone could prove it's their field, but I guess the recommended thing would be to not sell royalty free without a property release right?

 

Then there's this photo of St Pauls, it is a landmark but I think it was taken technically on their property? I'm assuming that i'd need a release even though it's not inside because I am on the grounds

 

Thirdly I have this photo I took from a public road (I believe, still trying to find this out as I type) and I don't believe I need permission if it's of a regular house facade and not on the property.

 

And lastly to my knowledge (but I just wanted to make sure) I don't need permission if a photo is in a non private woodland or on a mountain (Snowdon)?

 

Thanks in advance for any advice

P.S. I'm loving this automatic photo display system, no bbcode needed or anything!