The most obvious landmark viewable from my kitchen window is the Crystal Palace Television Transmitter. It’s about 6 miles SSW of here and does look like a rather weedy Eiffel Tower.
At 728 feet it was the tallest structure in London until the completion of 1 Canada Square at Canary Wharf (which can’t be seen even from my bathroom window).
The chimneys of Battersea Power Station are far shorter (about 350ft) but they are visible from my flat, if you lean far enough out of the…. aaaaaaargh! splat!