Just spoken to someone on the apple store website and she said that in the UK it would be shipped on the 28th and to allow 5-7 business days - dont know how standard post could take that long but going by how bad the delivery service was for my macbook I wouldnt be surprised - may as well just purchase it in store.
And, they are not doing discounts on Snow Leopard - i just went through the employee purchase programme store and its the only thing in the entire store that is not discounted - i know its pretty cheap for a new OS but still.
And, since when did $29 US convert to £25 ?! Thanks Apple!