Maple trees are just coming into their own now, with their beautiful yellowish-green flowers, seen in the examples below on the field maple, Acer campestre
And nearby there are some burgeoning terminal buds of horse chestnut (Aesculus hippocastanum), just breaking from their protecting sticky scales.
Meanwhile a red horse chestnut is far advanced compared with its much bigger relative. The red horse chestnut commonly found in England is a cross between the white one (above) and an American red buckeye, Aesculus pavia.