I have this morning placed an order with Wasp for the next batch of T-shirts. This means if you haven't ordered by now, you'll have to wait until the next order.
They are pulling out all the stops to get them back to us in time for Windsor and are hoping to get them to me on 27th September. So as long as I get them straight in the first class post, they will hopefully get to you on Saturday 28th. No promises, but it's possible.