I find the OS GetAMap site combined with GoogleEarth/Maps gives me most of the information I need.
But it really depends what you mean by "location advice". If you're looking for certain types of location in a certain area, then searching Flickr can be a very quick way of finding locations others have found (if people tag correctly). If you want to go to location X but want to know where the best parking spot is, then you can ask on this forum.
If you say what you want to know, it's easier to tell you where to find it.