Pakolainen

this has surely been asked 100's of times, did a search but most of the results were dead links.

just recently i've heard some knocking from the rear left side . drivers side. having read some of the topics about knocking a little paranoia has snuck in.
was hoping it was something in the boot bashing around, but..
Car is My05 WRX, warranty expired in March, 30,000km - kilometre - service was just done, inm march and i'm now at 36000km's.

any pointers to give?
tyhose topics that were still alive talked of struts, £900 replacements, kind dealers etc

cheers