So tonight I went to me (CofE) church and there was a special service to commemorate the 350th anniversary of the Book of Common Prayer. One of the key points the vicar made was that Jesus death on the cross was a once and for all sacrifice that we can add nothing to (i.e. the mass sacrifice) and also that Jesus is not physically present in the Eucharist. I got talking with him afterwards about the theological reasoning for the lack of the real presence. He said that Christ, in his human form, is subject to the normal constraints of human beings, and that given that he is in Heaven he can not at the same time be physically present on Earth in the Eucharist.
I'm left a little confused at this point. After believing all my life that the presence of Jesus in the brad and wine is just a spiritual notion, I have actually begun to start to accept the idea of real presence (after reading a lot of posts here and a lot of contemplation). But I can't get my head around how Jesus can be bodily present in more than one place at a time if he is subject to the restrictions of ordinary human beings when in a human state.