Legoland Windsor - combining deals

Hi forum-ites. We're looking to take a trip to Legoland in the next few days. We're a family of 4 - eldest daughter is 3, youngest is 1. We have a stash of Kelloggs 2for1 vouchers. Wondering whether we could use the 2 for 1 for the wife and I, then use a Kids Pass, as detailed in the deals section of the MSE site (can't post link), to get a discounted ticket for our eldest? Anyone else tried this?

Thanks!
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