Hello fdunne, and welcome to the forum.
With regards to UK track spacing, I always use the UK catenary double or quad spline, to mark out were the tracks will go, after I have placed the tracks, I then delete the catenary spline, and then you should be left with either two or four tracks equally spaced out, I have always found this to be the best way to place the tracks, even on curves.
Hope the above helps
Joe Airtime