NCRAS.
Id from pics can be hard. There are many factors to concider.
Size /shape of leaves.
Is shrub evergreen or does it lose the leaves in winter..deciduous.
You may be safer to wait until next year to see when it flowers and what the flowers look like.
A few facts below for you to concider.
Which may just be even more confusing!
Cytisus x spachianus
It is an evergreen that gets to be 10 to 20 ft high, very leafy and luxuriant in habit. Its young shoots are hairy and somewhat ribbed. Leaves composed of three obovate leaflets 1⁄3 to 3⁄4 in. long, mostly rounded at the end, wedge-shaped at the base; they are scarcely stalked themselves but are borne on a common stalk about 1⁄4 in. long; dark green and glabrous above and covered with silky appressed down beneath.
................................................
Genista monspessulana....
The leaves are evergreen, trifoliate with three narrow obovate leaflets, 1–2 centimetres (0.39–0.79 in) long
..............................................................................
Cytisus scoparius......
The shrubs have green shoots with small deciduous trifoliate leaves 5–15 mm long,
In winter it would look bare .
I would expect to see dry brown seed pods.
See link
https://keyserver.lucidcentral...
.................................................................................
