Around ten years ago Gil and Hillary Briffa retired to southern Spain. Instead of creating a home like the traditional old fincas in the area, their architect son designed them a confrontational, modernist glass box, surrounded by boldly colourful connected rooms, behind a giant citadel wall. A few years ago, Gil died, but now Kevin McCloud revisits Hillary to find out whether her home has settled into its landscape and how life is treating her as a British widow living abroad.