Thanks everyone.
I had another crack at levelling the edging. I actually levelled it horizontal and it doesn't look too bad!! The lawn does slope a bit but it's certainly not a dodgy job, and it slopes in a natural way. I might (eventually) try to compact the higher bits of the lawn - but not overly fussed.
Might try the advice of smaller plants along the edging to distract the eye a bit...

I'll send through a pic once I have completely layed the edging with concrete etc... Hopefully that will be Sunday...if the rains keep away!!

....and i'm not too hungover