https://www.toolstation.com/youngman-box-section-extension-ladder/p95920
Big enough to reach your gutters but small enough to stand upright in your garage.
Don’t underestimate how hard it is to store ladders. They’re massive, even little ones.
Pay someone to clean your gutters
Seriously though that’s what I do hate ladders and a decent one person ladder would be quite expensive.
if you’re dead set then wickes have dozens to suit your budget