The leaky hose works beautifully and I thought it would be the end of watering woes. However, I need to report that our clever idea of gravity feeding didn't work. There was not enough pressure and the hose was only leaking at the far end. We tried moving the barrel onto the verandah for more height but it still wasn't enough pressure.
We have now reconnected to the taps, so our electricity will increase due to the pump running, but the vegie garden is the higher priority at the moment.
I imagine if you built a very high stand you might be able to get it to work, but that is not a project we can fit in right now.
If anyone has a good gravity feed system I would love to hear about it!
Sorry, no photos. They just won't upload tonight.