horse chestnuts should have big sticky buds on them this time of year...defo not a birch, they don't get that big round here.
so that's a bonus sycamorethe shrub has single blossomy flowers and simple leaves (but more flowers than leaves) and defo no root system extending down the main trunk.
of these more pyracantha than cotoneaster, but not sure if 100%The shrub looks like pyracantha or cotoneaster...both of which will establish in a teeny amount of soil.
i think what you're seeing as sycamore is just the plane tree shootsso that's a bonus sycamore