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Thanks for suggestions, everyone. It was good of you to give me the references to the photos, but they are not my spider. The bodies here are much smaller and the legs spindlier. The adults seem to grow to about 4cm from leg end to opposite leg end, the babies are so tiny you can hardly see them. The whole body is virtually colourless. They do indeed appear during the day, and are often in pairs. i have never seen them before in this house, so wonder if the heatwave has anything to do with it. I can't say what colour they are, as the body is so small and the legs so fragile.