edgings kerbs

im going to get my driveway done with tarmac the trouble is my neighbours drive is lower than mine at the moment there is flat edgings seperating us which look hellish and is raised (its also on a slope).i was thinking of a monoblock edging to finish off the tar but this means concreting from the neighbours side does anyone have any ideas ?.also i bought a marshalls driveway circle which i wanted to place in the middle of the drive , just to give it a better finish and to break it up a bit can you see any problems with this i.e drainage ,tar not holding it in place

thanks for any help

if you are going on the theme of having a block paving decor circle in the drive then why don't you edge the drive in charcoal block paviors too.

by the way do you have p.p.?