Is it an Avensis sedan or Avensis Verso wagon/people-mover? Since you refer to us as "locals" I'll assume the Avensis Verso as that is the only one we ever got (as a replacement for the Spacia). Generally, mould in the boot/rear compartment is due to build-up of moisture and insufficient ventilation (which you tend to get in a boot anyway). Usual culprit will be the boot/hatch seal or rear window seal for a hatch/wagon(easy way to test is to get in the boot with a torch and get someone to hose the rear of the car down, and look for where the water is coming in). Other general (ie nto vehicle specific)possibilities will be the seals around the tail-lights, or the drain plugs in the rear guards/spare-tyre well (spray can come up from underneath the car if the roads are wet, and if a plug or grommet is missing then the water will seap into the guards and carpet, but this is unlikely). But if I had to Thanks so much for that - very helpful and informative. Will try the torch thing before i ring the mechanic!