My recent attempt at an oil change wasn't exactly straightforward as I had a little difficulty with the oil drain plug, (whole separate thread on this!
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Now eventually the bike has some nice new oil and nice new filter - all installed after reading the sound advice on this site. Everything should be hunky dory - filter installed the correct way around, with the hole you can wiggle your finger in facing inwards, and no problems replacing the spring loaded cover. The o ring on this also appeared fine.
The only problem I think I have is that I have just read there should be a rubber seal on the side of the oil filter which faces inwards There was no seal with the new filter and I can't remember there being one with the old filter!
This is basically a rhetorical post as I'm pretty sure I already know the answer - I'm going to have to drain the oil again and check this aren't I?