Nice recreation, Neville, but I'm curious about the artifacts on the left front and right rear wheel wells (plus a couple other points). Is it possible that you have duplicate items occupying (mostly) the same space? That has caused similar problems for me in the past.
TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1