UK's 'Unallocated' IPv4 Block Actually In Use, Not For Sale

jimboh2k writes "The UK may have 16.9 million 'unused' IPv4 addresses but according to the department that owns them, they're not for sale. The Department of Work and Pensions says it would be too expensive to reallocate those addresses and, even if it did, it would not stave off IPv4 address exhaustion by much." The addresses in question are being used for a new internal government network. Of course, why that project wasn't built using IPv6...