Right on a mission today, changed my fuel comp sender and sorted that out as well! Still got this fuel smell and it does not make a journey a pleasant one at all.
After a few more checks I think I have found the problem, it was right under my nose all the time, literally!
"Sniffing" around the boot with the liner out I found the smell was at it's worst around the filling area. After looking across the top of the boot from the top of the wing crouched down I could see fuel vapour coming from the filler cap!

Had a good look and it's got 2 holes drilled in it

I'm sure this is not correct as there is already a breather which comes off the tank and under the car. I'll see if DG or SD have a good one or anyone else got one before I seal it with silicone? It's the early type larger cap not the small one with the A on it.