05 WRX Seat knock/creak

[akafonzie]

Hi All, 

When moving from a standstill and just in general sometimes my seat knocks, has anyone else experienced anything similar? I'm not overly heavy, about 13 stone, and this has steadily got worse over the nearly two years i've owned her. I will definitely get around to having a look when i'm off for xmas, pending weather, but just wondered if it has happened to anyone else!

I know its not the rear suspension as i have that noise as well and it's separate! If i can't find anything obvious that's in need of tightening i guess it's an excuse to find an STI interior!