I don't much like the smell of new leather, and even though my car is three years old, I still find the cabin a bit overpowering sometimes. Is there anything I can treat the (ivory) upholstery with to tone it down without doing any damage?

Take your pick, these are very good and long lasting air fresheners.

I've bought a few different 'flavours' and they've all been good and potent.

My cars full of leather too but smells of cherries

http://www.google.co.uk/webhp#q=california+scents&hl=en&rlz=1R2DKUK_en&source=univ&tbm=shop&tbo=u&sa=X&ei=UQFxUY7jB-KH0AWKpIHoAw&sqi=2&ved=0CNQBELMY&bav=on.2,or.r_qf.&bvm=bv.45373924,d.d2k&fp=c59d7948ad5842ff&biw=1249&bih=570

Thanks, they look good, though I was hoping to have no smell at all, as opposed to masking one with another.

The best ideas I can come up with are Fabreze (usual caveats about testing on a small, concealed area apply), and drive with windows and/or sunroof at least cracked open whenever possible.

The best ideas I can come up with are Fabreze (usual caveats about testing on a small, concealed area apply), and drive with windows and/or sunroof at least cracked open whenever possible.

Yes, though you have to be careful with Febreze on leather, I think. Open windows are fine unless you want the AC, of course. A suggestion I found was a 1:2 mix of white vinegar and linseed oil. Might try that.