scooterdude - 2:34 pm on Jan 3, 2013 (gmt 0)

Return the 4xx status code at the originally requested URL to signify that particular URL does not exist or no longer exists.

I now intend to return 4xx at the url as recommended by most,

However my conundrum is that the urls do exist

I want human users to use them,

But block googlebot/bingbot et all from visiting/indexing/requesting thes urls which are barred via robots.txt already.

Might G with its penchant for penalties one decide that this was cloaking?