Hi . Hmm , not sure about this as I have no experience with the LE500 . My 05 plate MG TF does warm up quickly but I'm I dont think it warms  up so fast . I dont think the later LE500 differs much from the one I have , apart that is from the possibility of the  engine being the later 'N' series type. Some of the more knowledgeable folks on here might give a different view or maybe someone who owns the later LE version. I did own an MG ZR with the K series engine and that did warm up quick due to the fact that the cooling system capacity was small but you can say that about the TF . 
John  

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