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Water collecting under spare wheel & causing rust in well, & probably rust on Jack: Simplest solution is to drill one or two 6mm holes at lowest point in its floor [underneath the boot lock] whilst ensuring not hit any cables on underside [none on my 2003 Jazz]. Any rain-water will drain, and any surplus will evaporate safely.

Thanks for the reply. The problem seems to be getting worse. I stopped to refuel today and the car was very reluctant to fire up again. It is booked in for a service at the Honda dealers in a couple of weeks and I have warned them about the fault. I'll let you know what they find.

Hi Buddy, welcome to Jazz ownership . This problem is common on Mk1's i'm afraid ! The sealant around the rear hatchback welded and seamed joints develop cracks over time and allow water to get into the boot. You can , as I did keep removing the interior trim , and trying to track where its coming from using newspaper or wallpaper lining paper , cut into strips , to try to get a 'trace' . I even renewed the rear hatchback rubbers, (at great expense). All to no avail .! So after 9 years of ownership and 150000 miles , I found that under the rear floor there is a bracing band that goes from one side to the other. This has a hole in the middle , So fed up with sponging out the spare wheel well , I drilled two 10mm holes in the boot floor level with the middle of the bracing band . Hey presto , yes , water comes form above but not below , and runs out . This was my fix , and I'm not saying you should do the same, but on car worth less than a grand , it will stop the damp smell and water surging up and into the rear floors, if the water is allowed to accumilate.

We had a software update for the flat battery issues carried out last Friday. On Monday, I had to call out Honda Assistance again to start it.