I too have noticed a 'cold draught' when cornering. Thought it was a long lost relative trying to get in touch from the other side but reading this thread makes me wonder?
It is around about the gear lever area and is a definate chilly blow. Only when turning , very strange.
In the summer it probably wont be noticable. Must be a hole in the firewall somewhere.
coat, hat, dorr...............
2ltr TDCI Ghia 56 reg.