Good morning Oz,
Sorry for the messy OP. Attached is the Lightburn file, a pic of the rotary setting, and the output Gcode. This file takes about 2 minutes to run because the top and bottom of the oval slows to a crawl that it almost look stopped.
LB OVAL TEST Gcode.txt (2.4 KB) LB OVAL.lbrn (11.2 KB) 
Below is a video of the file running. Hopefully it plays.
https://photos.app.goo.gl/oVCgQsRJ68iBQcQh7
Below is rectangle being cut running as expected.