Unfortunately that is not Stampy's Lovely world seed. Stampy is a You Tuber and he made his world several updates ago, so it will not be the same if you try it now. The correct seed is : 6644803604819148923
I obtained it from Stampylongnose's facebook page where he posted it for people. But as he stated, the seed was made before several updates where made and some of his biomes are now shifted.
Please don't type all in caps as it is the equivalent of shouting. Second this seed for Stampy's Lovely World is for X-box only. Since he made his world though, there have been several major updates and some of the biomes have shifted. He has also done some re-sculpting of some of his land (filled in lakes, and flattened some hills).