Found the little leak.around the hinge area on the boot floor it was folded over so water is running in from side of window down seal gettin the fold and straight in to tool box
if it carries on getting wet ,,,,,
try and adjust the catch , will pull the door abit tighter , if u get someone to sit in the back of the car, whilst another person holds a hose pipe at the back door u can then check around the entire door
also put the hose underneath as it can come through on the welding of the boot box area
have a look at the back door glass, make sure the gap is equal both sides, as its common for the glass to be tight on the lh side and touches the plastic and doesn't allow the glass to fully close,
check behind the back door panel, at the bottom of the door the drainage holes can get blocked , just use the tube that's fitted on a tin of wd40 , blast it through the holes ,
hope that helps a little bit