been playing with this for a while and there is defo some oddities here. never got to 100% but the way it looks so far (anyone who can continue playing/testing feel free) but the New version of Inkscape adds a hidden bottom white layer. This makes the Trotec interpret everything as a bitmap and it will only engrave not cut.
The get round this, we pulled the Inkscape file into Illustrator and there you can see in the layer tool, the extra base layer. if you delete the white base layer (there may be several of them depending on the drawing) and then copy/paste the remaining lines into a new Illustrator drawing, the trotec works fine.
Need to check the colour and the line width in illustrator before printing though as this doesn’t default properly and needs setting explicitly.
Be really happy for someone to build on this but it worked for me and @Matt_Conde