In a small bowl, mix together the oil, milk and egg and beat lightly. In a large bowl, mix flour, salt, baking powder and sugar. Add the chopped strawberries and peach and stir to coat with flour. Pour in milk mixture and stir together.
Fill muffin tins so they are two-thirds full.
Bake at 190 degrees/gas mark 5 for 25 minutes, until the tops feel springy to the touch. Let them cool for 10 mins and remove from the tin.