My day would be ruined if I had to share car in the morning with someone with a really heavy perfume as it triggers migraines for me. My mum used to put Clinique Aromatics Elixir or Guerlain Shalimar on in the car when I was a kid - it was absolutely awful. It's been 20 years and my dad still enforces a 'no applying perfume in the car' rule :D
If you want to wear the perfumes you really like, then apply it when you get to work. You can even decant into a little purse spray like the Travalo ones. When going back in the car again, the perfume might have settled down a bit.
I really like Jil Sander Pure. I think it smells of laundry that has been drying outside in the sun. It smells of flowers and fresh air. Apparently it's also musky - I don't really smell it though, and it doesn't remind me of TBS White Musk.
Maybe one of the Clean scents would work.
The new Issey Miyake L'eau d'Issey City Blossom might also be nice - I haven't tried it but it's supposed to be floral and musky. The other l'eau d'Issey could also work for you.
The new Pleats Please in Bloom is also supposed to have the same notes - floral, musky, rose, so maybe that would work too. I haven't smelled this one either yet, but I do like the original Pleats Please
It's not really what you're looking for, but you might like the Guerlain Aqua Allegoria range. Some of them are very heavy, but others are very nice. I absolutely love Limon Verde - it starts off smelling like freshly cut lime, then gets a bit sweeter during the day, but it doesn't get sickly sweet. It's a lovely summer perfume IMO.
I'm not sure they're all sold in Boots.