Oh, yes, I have seen a fair bit of the third and fourth series (Martha was my Ten-era favorite). It's actually S1 that's my worst deficiency--I haven't seen any of it. I'm hoping to correct that soon, although I have a terrible TV attention span, even for shows I like.

I tried to show my children that one and they freaked out over the Candy Man

Oh, dear, is it really that scary? O_O