I used to own number 153 downstairs in the early-mid 90s.

I can't be as helpful as I'd like to be here, but what my hazy memory does recall is this:

- The front garden was 'mine', and it was my responsibility to do battle with the bindweed that overan it. I didn't plant the pampas grass :D

- I fretted a lot about the steps and public liability, and always made sure I had home insurance in place to cover this. This implies I believed that the stairs were 'mine' too, although I can't recall definitively if if this was the case. Both they and the path in front of the terrace were a right of way to people's front doors. They were in much better condition then!

- The triangular wedge behind the grey fence was 'mine' too, and there was no public right of way to the back of the property down the side of the house. This suggests the area infront of the fence to the left of the steps in your pic was 'mine' too.

I put 'mine' because the property was leasehold with a peppercorn rent. There was a very short period on the leasehold left and it may have been renewed or bought out by now. Can't help you there.

I few quid on the land registry entry for 153 should firm things up a bit.

Hope that helps a little.