Like i said, i know how to install an oil filter - done it plenty of times before.Rip it off, make sure you wipe the mounting surface on the engine shmick clean. Then a light smear of oil on the new filter gasket and remount a new filter. Also spin till it seats and then just a half turn and your done.
Over time gaskets, orings etc get hard and perish, which in turn leads to leaking in some cases.
Gave it as best a clean as i could (kinda hard to reach in there), oiled the o ring and did the filter up properly.
The car has since done a whopping 35kms so i seriously doubt things have dried out and hardened in that time.
In that short amount of time, the leak has been enough to cover the sump again.