You probably mean this: <a href="http:&#x2F;&#x2F;www.crossrail.co.uk&#x2F;news&#x2F;crossrail-documentary-the-fifteen-billion-pound-railway" rel="nofollow">http:&#x2F;&#x2F;www.crossrail.co.uk&#x2F;news&#x2F;crossrail-documentary-the-fi...</a><p>Not on iPlayer any more but you can buy it on DVD if your don&#x27;t think tunnelling is boring. :)<p><a href="http:&#x2F;&#x2F;www.londonreconnections.com" rel="nofollow">http:&#x2F;&#x2F;www.londonreconnections.com</a> is also a detailed resource.