Loving having my own car back after its flywheel replacement, managed to get 62mpg on the crawl around Aberdeen the other day which was pretty good.  

 

But...... I now have a hissing noise coming from under the rear seat. Sounds like my fuel pump has started to become quite noisy. Fingers crossed it doesn't get any worse. It's been reported to the dealers but am going to wait to see (hear) if it gets any noiser.  Hope I don't lose the car again for another 6 weeks...

 

Has anyone else had the same / similar issue?

Check this thread out

http://www.briskoda.net/forums/topic/299224-hissing-noise-from-the-back-of-octavia-3-diesel/

Cheers DM, I even remember reading that post when it started, just didn't click! I will send a copy of this thread to the dealers as well.