what is the purpose of a LP

Wow - thank you for that explanation, George. When I was tentatively diagnosed 20 years ago my neuro told me that a LP would normally be undertaken, but as I was fit and healthy and seemed to not have serious symptoms, he told me to go away and live life to the full and not dwell on things.

It worked up until 18 months ago, too.

Yes, George gave an amazing explanation! It made my mind up and I’m now not on list to have one done. Phew!