Tiling border around windows

[MikeJM]

I'm tiling into window reveals and i've got a problem. Anyone know the simple method for cutting mitres in plastic border trim? I want the trim to go on the room wall overlapping one tile thickness plus adhesive into the window reveal.
Grateful for any advice.

 

[gcol]

Not 100% sure what you're after doing Mike, but if you have trim you cut it with a mitre block and reasonably fine toothed saw.