I finally managed a mirror box. Thanks Babs for the link. It is a grey day here and we are expecting some rain fortunately. As we are in Autumn, this Spring blossom was taken last year.
Works really well, the only thing you haven't done right is to flip the top and bottom vertical, it looks as though you have flipped those horizontal the same as the left and right. Apart from that it is brilliant. Well done. They do get easier the more you do, but the first one is always a struggle.