If the numbers posted in the article are correct (324 to 229) then this is not wafer thin. Only libs would call a 61% election wafer thin if it was in favor of the conservatives.
In parliamentary terms, he has a majority of less than 5!
Historically that is nothing, and nobody would call that a landslide over here. Not even close.
Any I am not a lib, I am actually a conservative unlike Cameron.