Okay, so I'm overheating during a scoop run and am reminded of this issue so I go to post it on the issues tracker, quick search first to make sure I'm not posting a duplicate and lo'! I find somebody has posted it and it has been marked as invalid with the following response:
Ermmm.... no FD, it's a bug you introduced this year, it was fine before the FSS update whichever that was.
https://issues.frontierstore.net/issue-detail/295
STATUS INVALID
This is not a bug as it is sadly an unfortunate side effect of the particle system. We wish there was something that we could do about this and if we ever find a solution we will come back to it.
Ermmm.... no FD, it's a bug you introduced this year, it was fine before the FSS update whichever that was.
https://issues.frontierstore.net/issue-detail/295