From 750g of seed potatoes plus a couple of Dutchies from a retailer, harvested 3.730g.
Planting in August is a tad too late in the heat ... next time I'd plant as soon as the eyes have developed. And I'd give them a tad more space, too. A 300L bed was a bit cramped. And I'd mix compost (if I have enough!) with the cane mulch and try and encourage some more tubers further up the stems.
The cane mulch plus the layers of 30 percent shade cloth I used to extend the bed depth allowed the tubers to grow without any light.
There's some upside and some downsides - when was anything any different? ;-) I've learned a lot from this exercise - previously if a potato plant came up I'd let it be but I didn't do anything special to it - of course the crop was hardly worth digging!
Next time - there will be a 'next time' I hope the eyes develop earlier in the season - planting March-April would give them a cooler and longer growth period. They were really floundering these last couple of weeks and I decided this morning to dig them up and was really pleased with the results given the very short time they were in the bed. August to October is not a long time for potatoes.
Here are the photos, on Flickr.