Does seem like a superb deal, has to be said. Free signed shirt and 52 chances of winning a grand (or one of 10 x £20 runner-up prizes). What's not to like?
I took advantage of the previous offer a few of months ago for a free shirt (non signed). Kind of wish I'd waited but still a good offer back then.
I guess they've got a fair few shirts to get rid of before the end of the season.