Horse Chestnut.
The candelabra of suburban avenues and the source of childhood conkers,as well as the sticky buds of biology/botany lessons, this tree, which is native to the Balkans, is well integrated into British life.

It became popular here in the 17th century where it was planted throughout Europe along avenues, churchyards and parks.
It is our only tree with large, radiating, compound leaves. It’s name perhaps comes from Turkey where, in 16th Century where it was said that they used to feed the nuts to coughing horses, but horses don’t like them, cattle do! Another theory of the origin of its name is that the leaf scars on twigs resemble horseshoes, either way, both are plusable.
Nuts are supposed to grow into seedlings in Britain but it is unusual to find one that has not been planted on purpose.
Uses

In herbal medicine the horse chestnut is used to treat varicose veins and hemorrhoids.
For centuries the large shiny nuts that are enclosed in spikey cases are used by british children to play a game called conkers where they are attached to string and hit against each other, the looser being the one with the broken nut.
There’s hearsay that if you place conkers around your house it will keep spiders away, but there’s no scientific proof that this is the case.
The Victorians wrote recipes for making conker flour. The seeds were shelled, ground and then leached to remove bitter flavours. It’s not a common practise these days and if consumed in excessive quantities conkers are mildly poisonous.[efn_note]Woodland Trust[/efn_note]

They can grow up to 40m in height and live for 300 years. They have leaves which are large green and palmate (finger like) with 5-7 leaflets. The flowers are beautiful towers of pink or white flowers. which turn into green spiky fruits.
The flowers provide a rich source of nectar and pollen for insects, particularly bees. Caterpillars of the triangle moth feed on its leaves, as does the horse chestnut leaf-miner moth whose caterpillars provide food for blue tits. Deer and other mammals eat the conkers.
Hybrid Horse Chestnut
Aesculus × carnea, or red horse-chestnut, is an artificial hybrid between a red buckeye and a horse chestnut. The origin of the tree is not known, but it probably first appeared in Germany before 1820. The hybrid is a medium-size tree to 20–25 m tall, halfway between the each of the parent species in most respects, but inheriting the red flower color from the red buckeye. It is a popular tree in large gardens and parks.
Get connecting and enjoy,
Tom