Looks like mildew on the Geum - spray it with a solution of 1 part cows milk to 9 parts water. As for the Streptocarpus, looks like sun damage or sunburn more than anything, but I don't know if that fits the picture, not knowing where its been kept. Its otherwise healthy, the new growth looks normal.

When watering stretocarpus try not to get water on the leaves as that might scorching when in the sun

Kaiglen- it sits on a partly sunny window sill and I think it was scorched outside when I popped it outside whilst cleaning windowsill. Oops think I left it out a while... As Bamboo suggested think it got sunburn.... Would it be best to water by means of putting it in a shallow tray of water soaking it up through the roots?

That's a more tropical species of Streptocarpus than most, and cold water (< 27 deg. C) on the leaveswill leave bleached spots, like its relative, African Violet.