I think a gutter downpipe on my house is blocked. When only a small
amount of water is fed into the gutter (garden hose on a ~very~ long
pole), water spews out of the elbow just beneath the gutter and hardly
any comes down the pipe at the bottom.

So I reckon moss or maybe a dead bird has lodged in the downpipe,
probably in the elbow itself, or just below.

I don't have a long ladder. So I wonder whether I could push a spiral
drain unblocker, the sort with the handle to turn, UP the downpipe
from below. The distance from the ground to the underside of the
gutter is 4m.

Or would the spiral wire just collapse back on itself due to gravity
and weight?

The two spiral unblockers I have my eye on are the Screwfix one for
£22.99 or the much cheaper Silverline for around £8.

By the way, my downpipes are round white plastic 68mm in diameter.

Any other suggestions most welcome!

Thanks again.

MM