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It's hard to tell from the pictures, but these look completely fine to me (as road markings go). I'd be extremely surprised if it was this paint that caused your fall (but I'm not an expert). I've certainly seen paint markings that I think could have caused falls, but they were raised up much higher than these (sometimes caused by several stages of re-painting them).
I imagine you've probably thought about this possibility, but could there have been some kind of object in the carriageway that might have been caromed away by you hitting it, so that you didn't notice it when inspecting the spot a little later? Apologies if that was definitely not the case.
Thanks for your thoughts, I have been back to the site of the accident, here are some photos of the road markings, I am fairly convinced that i didn't hit the manhole unless I went flying 50m down the road to where I ended up, but could be wrong.
I do have the contact of a witness so may need her version of events.
Here are some photos of the road markings are they unnecessarily bumpy? I believe the maximum raised height is 5mm?