I'm in a similar situation, with both UK and German passports. Twice last year I entered Iran with my German passport, UK registered car and UK driving license, no problem at all.
The issue is only in issuing a visa, at the border, if you have a visa, they don't care where you are from. You won't have any issues.
And I would strongly recommend a visit to Iran, it's quite unlike anywhere else.
It's been said a lot on this site, but just to re-iterate, do not tell the agency which gets you your visa reference number (aka visa invitation) that you plan to enter in a private vehicle, or they will tell you that a guide is required. Just be a good tourist and say you're flying in and out but want a visa ahead of time for peace of mind.
Good luck
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EurasiaOverland a memoir of one quarter of a million kilometres by road through all of the Former USSR, Western and Southern Asia.
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