FYI - luggage storage Christchurch by Cathedral iSITE
 

For anyone else that might be interested.
I was searching for luggage storage in town in Christchurch for time between airport flight and Akaroa shuttle.
Checked with the i-SITE and got the following reply:
"Yes there is a place straight across from us (Christchurch i-SITE) called E Blah Blah. This is a big internet café but also had luggage storage for suitcases etc."