It is definitely Nelson's Column. It was cleaned this summer and the contractors found that their prepared scaffolding did not fit because it was 16 feet shorter than had previously been supposed.
I think I read somewhere recently that Everest had actually risen in height,not sure about that.though.I do know that they measured K2 a couple of years ago by sattelite,and found that it was higher than Everest,but when they get round to measuring Everest in the same way that Everest will be higher than K2.Might be worth looking into.