It's ivy. Evergreen with greenish flowers followed by the berries. It can cause damage to trees and buildings as it is a vigorous grower and can become very heavy. It also anchors itself into mortar so be wary of it near walls. It does however provide year round interest and shelter for birds.

NB to US readers. Note that the OP and the responder are in the UK .... so no need for tirades about the diabolical invasive nature of 'English' ivy ;-) Here it is native and part of the ecosystem. The fact the berries are still there shows what a mild winter we have had. Wood Pigeons,especially, love them. And the flowers are a valuable food source for insects late in the year.

Hedera helix, proper name not yet mentioned here. Good catch, Flora!

Location was not posted here. I fairly often have to look at My Page in order to see where people are because they do not say in their posts.

Sometimes they don't say on My Page either.

Being obtuse tends to limit outcomes.

I checked their 'My Pages' to verify location because of the use of 'garden' for yard and the simple name 'ivy' without the 'English' epithet. Plus the responder noted that ivy is useful ecologically speaking and commented on the mild Winter. All that pointed me to compatriots. I don't think anyone was being obtuse. But it's true location in the body of the post is very useful to know.

LOL!! A "yard" to me is the enclosed outdoor area of a prison complex - anything where one grows plants is a garden. And the winter has been pretty darn mild here (as usual) as well, so these may not be the best qualifiers for a UK sourcing :-)

Yet very many people here do call them yards, with a garden being where vegetables are grown.

So PNW and the UK have even more in common than weather.

I find that I can usually tell if it's another Brit 'speaking' by the vocabulary, syntax and tone of voice. For example, the words 'vine', 'an' herb, shovel and till are give away for a US poster. Canadian and Australian posts lie somewhere between. I find it fascinating guessing and then checking the My Page.

But as you say gardengal48, there are regional variations in the US which can fool one.