I don't think it's very easy to get hold of any more. It was all the rage in the 70s because councils up and down the country were tearing up their flagstones and flogging them off cheap. Nowadays all they tend to have is tarmac.
The 'builders' who re-built our kitchen (before we bought it) put all the bricks in the back garden on top of the old patio and covered the lot with soil and turf. Therefore if you want to come and collect them i have a large amount of old bricks / slabs etc needing a new home.
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http://www.photoblog.com/Jarvo/2009/08/10/267-wells-reclaimation.html