After today's Andrew Marr Show I doubt if Millar and Wiggins will exchange Xmas cards...but I'm sure Wiggins will be sending one to Mr Marr forever.
On a historical note, in 1988 Pedro Delgado was a shoe-in for Le Tour when in late July a few days before Paris he was found to have taken Probenecid (which is a masking agent). Probenecid had been an illegal drug according to the IOC (Olympics) for a year but the UCI (Cycling) was a bit slow and were due to ban it a few weeks later in August, which they duly did.
Delgado was pretty cool about it all: "it's use is not illegal" and indeed that week, as distinct from a couple of weeks later, it wasn't (outside the Olympics).
Delgado won his Tour. His only win; but as Wiggins knows, one Tour win means never having to work again.
In cycling "it's use is not illegal" actually translates as something else.