I bought the ones from the other sets so i have all types of knights, then i replaced most of the heads on the other 10 so that no knight looks alike.
Yes i had the Mine shipped in, there was no way i was willing to wait until April for it. Also as Argos has this crappy deal with lego there was no way to be sure we would even get it at all :-(
I have spoken to a lot of shop owners about the Argos deal and it seems they were not even offered the chance to sell the castle sets, it seems lego has decided to offer certain shops certain sets like offering woolworths the option to carry the SI.