Accidentally I did my bit...
Up to Bridge of Orchy yesterday, and did some extremely dubious acting in a murder mystery play. It turned out that "it was me who dunnit" which was a bit of a shocker.
Getting up there was initially a bit stressful because having checked over the vehicle the day before, I moved it out into the street on Saturday morning, where it sat leaning to the right for a few minutes, during which time several drops of fluid dripped out from the seam at the base of the fuel tank. Then followed 40 Minutes of frantic shoving of quick-set epoxy into the seam, in what I assumed would be a failed attempt to stop it. However, we got 20 miles and the epoxy had set hard by then, so I put in £40 of petrol and none seemed to drip out. Nor any drips for the rest of the ~70 miles up (that I could see), overnight, nor 70 miles back today.
I am not sure I believe that my rushed bit of epoxy-shoving can really have stemmed an actual leak that well. I am wondering if it's possible that a VERY slow leak ?perhaps from the bottom tank plug? has allowed a tiny pool of petrol to form between the 2 skins at the base of the tank, and that having the vehicle lean to the right has just allowed those few drops to escape, and not be replenished by a VERY slow leak??
I'll have to wait and see what develops, if I ever see another drip.