Hi Neil,
I too really like the jig tool posted by Sir ramic very handy to have in the tool kit.
Although I don't use one. I use a piece of 20mmx20mm pine moulding with one end cut at a 45 deg angle and place this against the wall acting as the tile edge, then mark with a pencil the other end allowing for a tile spacer, flip it over and mark the other side (Only if angle is greater or in some way differs from 45deg) then place the stick onto tile lining the pencil mark up with the edge of the tile and mark the 45deg cut end the place on cutter and score and snap, should fit sweet.
There are plenty of other ways to scribe tile angles but i find this method quick and inexpensive although I might just get me on of those jigs
I'll try and post a pic of what i'm waffling about as it will be alot easier to visualize.
Glad you are enjoying the posts.
Cheers Mick