ah, bbc.co.uk does have IPv6 addresses $ dig +short aaaa bbc.co.uk 2a04:4e42:200::81 2a04:4e42:600::81 2a04:4e42:400::81 2a04:4e42::81
but not www.bbc.co.uk which is CNAME to bbc.net.uk according to the SOA for bbc.net.uk there should be a b...@bbc.co.uk who can answer why!