Jonno wrote:
You silly duck. I knew this instinctively

Right from this web page. http://www.crfg.org/pubs/ff/passionfruit.html

Pruning: Pruning is necessary to keep the vines within bounds, to make
harvest easier and to keep the plants productive by maintaining vigorous
growth. In warm winter climates prune immediately after harvest. In
areas with cool winters prune in early spring. As a a general rule
remove all weak growth and cut back vigorous growth by at least one
third. In very hot climates allow a thick canopy of foliage to grow
around the fruit to prevent sunburn.

Another good site, thank you. Isn't google a wonderful thing?

I suppose I could have got all the answers I wanted from a google
search, but it's so much more fun asking you guys.