Mondeo Sedan Rattle?

[Treny]

Love this car! Great fuel economy from my 2007 TDCI but I have a rattle that seems to be coming from the left rear seat belt area? I have looked for eny loose items in the boot or spare wheel area and all is fine. I intend to get Ford to check it out at it's next service (15000k) if I can't find and cure it. Anyone else with any ideas where to look? Also on occasions there is a thump from the rear when going over a bump it happens rarely so I think it is in the suspension and not something loose? The car is that good I can live with these slight irritations.