Asp.net - Dealing With Data Returned By A Web Method As JSON With JQuery?

[URL] Using this I have managed to use Server Side Web Methods to perform actions with AJAX.In most instances, I just need it to do stuff (save things to a database for example) so don't need to do anything with the response, but now I've come across a situation where I do, and I can't work it out!The Web Method returns a JSON object, which looks like this:

{"d":"[{"validDetails":"True","lateAlert":"","LoginResponse":"Logging in Jamie at 16:53 please wait"}]"}

This is the output shown from Firebug. I am not sure what the 's are, but bear with it...The AJAX call and attempt at outputting this response is:

$("form").on("submit", function () {
var LogonObject = new Object;
LogonObject.password = $('#password').val();

[code]....

And several other variations from info I have found on Google and SO, but it seems to treat the results variable as a string, not an array, and the output I get on the alerts is each individual character, ie;

[, {, ", v, a, l, i, d, D... etc

So I wondered if results needed to be converted to JSON again (though I don't know why) so I tried

results = $.parseJSON(data.d)

But that didn't work either.

EDIT, the code which generates the response (missing out tons of logic, but this is the important bit):

Public Class OutputObject
Public validDetails, lateAlert, LoginResponse As String 'content of JSON output'
End Class

[code].....