siteguru
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It's also associated with the SE ... I should know, I have it and created a whole thread about it. That's why people should be more complete with their references.R33 is associated with the Trophy spec.

1100R33 is for the SE (and is the latest)
1300R33 is for the Trophy (and is not the latest).
@gwatuk 1100R21 is the latest that is installed as standard at PDI ... 1100R33 is only installed if you report specific issues (e.g. lack of external temperature indication is a safety issue; e.g. you're having Bluetooth issues).