There have been many threads on this and I'm not sure there's an awful lot more to say. You've done the right thing and had an extended test drive, so buy the car and take a view as to how you want to proceed - you will get different opinions on here, but the info's all there to make a decision in your circumstances.
AIUI Horton uses Lucas when indicated by previous harsh shifting, as opposed to routinely adding it.
Quoting a mileage would be helpful for others.
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