Tile on tile finishing

[RKB]

I know there are mixed views on tile on tile, instead of removing the originals.
If I was to go with the tile on tile option, how do I finish the top tile?
It's just that say where the tiling stops half way up the wall (over the bath), there would be a definite "ledge" that would be visible. Would I be best covering the edge with grout? or somehow applying an edging that would cover the double thickness?
See what I mean?
Thanks

 

[Diyisfun]

You can buy half round edging tiles, use a contrast could look quite nice

 

[Panjandrum]

Turn it into a feature and put a colour-co-ordinated wooden edging - or indeed a shelf - along the top! Makes the thickness of the tiles disappear - but only works if the designer agrees this is a good idea.

 

[RKB]

Good ideas.
I'll see which way the ma in law wants to go with this.
Thanks guys.