Maybe an English ivy, Hedera.

Not maybe.

Yes. Ivy has two forms, the climbing form and, when it gets to the top of its support, the arborescent form which produces flowers. You can see both forms in the photos.

Thank you all. I googled Hedera and the flowers aren't the same. The creeper in question has flowers that remind me of groundsel. I took some pictures yesterday. It was the last flowring branch, quite hight up and hardly visible at first glance. I should have taken a better look the first time around. The leaves, too, are different from Hedera's.

Edited to add: There IS ivy next to the creeper. These are two different plants. I'm familiar with that sort of ivy. I guess that's the source of the confusion. the small ivy leaves in the lower part of the original photos do not belong to the creeper I'm trying to ID.

If Hedera doesn't fit the bill you might be looking at Senecio angulatus .

tedhort - Yes, Senecio angulatus fits the bill. I also discovered that according to Wiki, it's known as creeping groundsel. Its Hebrew name (I'm in Israel) would translate as "angular groundsel". Thank you!

We have a lot of it growing, almost like a weed, on our coastal areas.

Very sneaky of it to be growing up through ivy.

Creepers can't help being sneaky :)