I got the list from the offical top gear website:
http://www.topgear.com/content/tgonb...times/thestig/

And you seem to be right since the original list doesn't have the LP640, which is sitting at a VERY NICE 6th place. Now im still curious to see the Murcielago Superleggera lap time.

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Exclusive street race:
Saleen S7 vs. Lamborghini LP640 vs. Ferrari Enzo!!!!
http://youtube.com/watch?v=i8O-szIV-OE