The .uk zone has been signed since March 2010. I've been signing zones registered via A&A using ISC's DLV service for some time. It would be good to actually get secure delegation from the root for at least some of my domains -- which means adding DS records into the parent zone alongside the NS records used for delegation. Like this:
% dnssec-dsfromkey Kinfracaninophile.co.uk.+005+60269
infracaninophile.co.uk. IN DS 60269 5 1 25EFABDBD3F1002AB2ECA2527FA8EB67FB41734E
infracaninophile.co.uk. IN DS 60269 5 2 1B069F1E1BBCC8DD710DF5402DE0ECE7DD7591BF18644BA90EE1AF1D C1D0E409