Posted a bit of background to this in another thread, along with my attempt at describing the thermohaline circulation. If we want scientific info, how about the info in this: Seager, R., Battisti, D.S., Yin, J., Gordon, N., Naik, N., Clement, A.C. and Cane, M.C. (2002) Is the Gulf Stream responsible for Europe’s mild winters? Q.J.R. Meteorol. Soc. 128, pp.2563-2586. This suggests the gulf stream only contributes 3c to our temps. 9c from the atmosphere and 8c is released from the oceans.