Generally on the TDi's, blue smoke is one of two things.
Turbo oil seals, or valve stem seals. Or so i believe anyway. Someone please correct me if I am wrong.
But yeh, kind of worrying.
Wasnt just me that noticed it either. A few of the lads mentioned it as you pulled in.
Would your car not have warmed up by then anyway, seeing as you had just arrived?