Me again with more useless information. According to
this (right hand side in the box) it's about 40 mins. from Whitecliffs to the outskirts of Christchurch. Looks a massive place with all of 117 residents in 2001 so it could be up to as much as 120 by now

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I don't know if this is right but I've asked on
here for directions from Whitecliffs, Coalgate to Christchurch Hospital. There were other hospitals mentioned but I thought I remembered you saying you were going to Chch Hospital. Directions are on the left and map showing the route on the right. The route should show up in blue but on my screen the blue line flits between yellow and blue. You can drag the map around as you wish. If I haven't got the correct places perhaps you can fiddle about with it.