Apparently this has been around since CoE aired last year - on Cardiff Bay, where the "official" entrance to Torchwood was (where Gwen delivers pizzas in the first ep, and Ianto sometimes gatekeeps), there is a shrine. To Ianto and Jack/Ianto. Fans have brought petitions and pics and fanart (in plastic folders for weather protection) and coffee cups and paper crane chains and flowers and little Ianto teddy bears, and tied them to the grating. Much to the bafflement of hapless passerbys who have never heard of TW ^^ (there's a sign explaining what's it about, but...)

Gnine's got pictures she'll have to post - here's a shot I found on Google which gives an idea, though when we saw it there was even more stuff - the whole grating was covered with stuff, a couple layers deep, some of it!