According to Spanish website abc.es Jay was in Paris on Friday buying a 1962 Ferrari 250 motor car.

"...The buyers, according to the auction house were all individuals, and among them was the lead singer of British band Jamiroquai, Jay Kay, who was present at the meeting and agreed to pay 190,300 euros for a Ferrari 250, 1962."

I'm not sure if he managed to be in London for the Rock The House competition launch that he was announced to be also attending though on the same day.