what to do with sloped boundry

[nick9one1]

My neighbour recently had some work done on the path down the side of their house, and drive.
In the picture below, you can see a new block paved boundry line has been installed, and they have had grey/white gravel put down.

Previously there was no visible boundry and the gravel spanned across. It's difficult to tell by the photo, but our side is about 6" lower. This has always caused a problem with the gravel spilling down onto our side. They decided to have the boundry line installed so there was a step between the two levels, solving the problem of the gravel spilling.

Unfortunately it's now worse. On our side there is cement holding the block in place at a 45 degree angle. So its now steeper than it was before.
I've decided to remove the gravel on our side.

I'm trying to decide what to do. The best solution would probably be to get rid of all the grass shingle and slabs, then tarmac the whole lot to the boundry. But we dont really need a wider drive, and it would be quite expensive to put down 12 square metres of tarmac.

Other options would be to dig up a few inches of soil either side of the slabs, and cement it.
Or maybe a DIY resin drive kit to replace out shingles.

Any thoughts?

The other slightly annoying thing is the block paving has been installed in the middle of the boundry. Essentially reducing the usable width of our side.

 

[freddiemercurystwin]

I'm struggling to understand what the problem is?

 

[nick9one1]

I'm struggling to understand what the problem is?

I want to tidy up and replace the gravel on our side with something that won't constantly spill down.

This image gives a better idea

 

[freddiemercurystwin]

(Strips) of paving either side? Could be contrasting paviours.

 

[scbk]

You could dig it out a bit more and have angular (crushed) gravel, just below the top of the slabs.

Crushed moves about less than the round gravel you had before

 

[rqy99g]

It's too late now but they could have used something like this...

 

[Odds]

artificial grass would be ideal.

 

[Harry Bloomfield]

I want to tidy up and replace the gravel on our side with something that won't constantly spill down.

This image gives a better idea

I'm surprised that there is a change in level at all, over such a narrow width of shared space. Sensible, would be for the entire width to be shared, and perfectly side to side flat.

 

[foxhole]

Cold lay tarmac?