I was bored.. and reading RSM.. as you do. And stumbled accross this.
http://www.rsm.govt.nz/cms/policy-and-planning/current-projects/digital-terrestrial-television-frequency-restacking/timing-and-channel-information
It seems they are jiggling the current band usage of freeview from May and will effect anyone outside Auckland with a non certified (or self updating) box
Will likely poke your planned PVR recordings too :)