It very much seemed that the club ride a couple of weeks ago that was a deluge for 100 miles has destroyed my bike 
Not only have I now replaced the headset that was oozing funny gunk everywhere AND not only is my lovely white bartape not really very white anymore, but afterwards I was getting a horrible creaking whenever I pedalled firmly, particularly on the right hand side.
I put up with it for a couple of days, then I bought a bottom bracket spanner as I thought I might need to investigate. I haven't had chance yet though, as I still haven't bought a crank removal device (a minor oversight).
Before I set off yesterday I thought that I better squirt a bit of GT85 round just to see if it would help and... as if by magic... come yesterday afternoon, she was as quiet as a mouse.
So...
Was that all that was required? A bit of gentle lubrication?
Or...
Is that just a temporary quick fix that will only last for a few days before it goes back to how it was? I.e. do I need to take the BB out and grease her up like a cheap Peruvian hooker?
Or...
Am I even looking at a new BB?
Any advice gratefully received.

Not only have I now replaced the headset that was oozing funny gunk everywhere AND not only is my lovely white bartape not really very white anymore, but afterwards I was getting a horrible creaking whenever I pedalled firmly, particularly on the right hand side.
I put up with it for a couple of days, then I bought a bottom bracket spanner as I thought I might need to investigate. I haven't had chance yet though, as I still haven't bought a crank removal device (a minor oversight).
Before I set off yesterday I thought that I better squirt a bit of GT85 round just to see if it would help and... as if by magic... come yesterday afternoon, she was as quiet as a mouse.
So...
Was that all that was required? A bit of gentle lubrication?
Or...
Is that just a temporary quick fix that will only last for a few days before it goes back to how it was? I.e. do I need to take the BB out and grease her up like a cheap Peruvian hooker?
Or...
Am I even looking at a new BB?
Any advice gratefully received.