I'm guessing that you didn't take my general advice the other day that all v6 owners should paperclip their cars, and hence you didn't know your cranksensor was going to fail?
Unless the crank sensor causes the engine to become a Sauna then no 
What was the problem in the end mate? Do you ever get down my way?
Very rarely - I'm pretty much next door to Pete tho...
Not too sure on the problem yet... The RAC bloke suggested a few things...
Possible HBV giving in a bit when the coolant system is fully pressurised (its fine when cold/just warming up)
Pete said about the Oil Cooler sealing plate thing, may not of been sealed right or could of just sprung a wee leak. Also said about possibility of dodgy plugs & leads for the poor running as he said the plug wells were full of oil when he did the rocker gaskets.
RAC guy also said the main cooling fan wasn't kicking in, and the only one kicking in was the aux one at about 100... so the fans were kicking in well after boiling...
RAC guy also said that there might be a problem with the thermostat?? He let the car reach around 95deg with the cap off the coolant bottle to get rid of any airlocks, and said the water was still cold in it while the engine itself was warm & toasty. The waterpump was working though as when the engine was hot, and the coolant res started to heat up, the water was pumping through ok.
Oil filler cap was a bit mayo-ee... BUT its the first 12 miles its done since Pete did the oil cooler & such, so its the first proper run its done. So will more than likely just be condensation

Also worth a note, when I stopped at the garage to admire the sauna, the coolant level had dropped about 1cm from MAX on the bottle itself, so whatever the leak was it wasn't that bad at the time...