Well, I got the new radiator. You were right about the hoses falling back into their original shape. The car nows runs nice and cool.
Interesting point: I took the radiator down to a local engineering shop and because it is an aluminium core, he couldn't fix it. One of the annoying things about this (yes there are several), is that the radiator was only 3 years old and I have always put in the additive. The last original lasted 8 years. So I got some metal putty and plugged the hole. Traveled 700km's before swapping over. I have full confidence in the putty working. I have used it to repair cylinder heads before. Anyway, he said that he had a similar problem with his Landcruiser. He said the because the radiator is mounted on rubber bushes, it doesn't earth properly. I checked it and sure enough, the volt meter showed 0.25 volts. So I have now made an earth strap so my radiator will last for many more years.