No worries.
Also remember you can open up the solder mask so that when the board is wave soldered, the solder will add to the thickness of the tracks, thereby adding to the current carrying capabilities.
On the top side of the board, you can also open up the solder mask & the paste stencil (in a grid pattern) to lay down extra solder paste over the tracks / copper pours. I often do this to add current carrying capabilities & for extra heat dissipation. An example (generated in DipTrace) is attached. The red layer shows the exposed copper (no solder mask) & the yellow/gold shows the solder paste "squares" that will be laid down on the top layer.
2oz & 3oz copper is also the go for extra current capabilities.
If you feel that you would like to try another CAD package, take a look at Proteus - the developers are in the UK just like you
I like & use it a lot.
I also use Altium, but it comes in 3rd as far as ease of use. I also dislike Altium the Company as I'm sure you have also read in some of my other posts.