This is it and it may be found under the section heading, Historical attributions:
History Today article
In an article published by History Today in November 2014, British scholar Charles Freeman analyses early depictions and descriptions of the Shroud and argues that the iconography of the bloodstains and all-over scourge marks are not known before 1300 and the Shroud was a painted linen at that date, now much decayed and faded. As it was unlikely that a forger would have deceived anyone with a single cloth with images on it, Freeman seeks an alternative function. He goes on to argue that the Shroud was a medieval prop used in Easter ritual plays depicting the resurrection of Christ. He believes it was used in a ceremony called the ‘Quem Quaeritis?‘ or ‘whom do you seek?’ which involved re-enacting gospel accounts of the resurrection, and is represented as such in the well-known Lirey pilgrim badge. As such it was deservedly an object of veneration from the fourteenth century as it is still is today.
Hat tip to OperaLady