I actually did a whole Wally book at a kids' space when my kids were playing 3 weeks ago. When I say "did" I mean I found all the Wallies and all the wizards. I didn't faff about with the look-a-like wallies.
I have no idea why that particular Wiki link wouldn't work. I tried it three times. In the end I used another Wiki link to the page about the British creator of Wally.