@ Stewardflyer
My medical says I shall wear corrective lenses and carry a spare set of spectacles. I do just this. Because it says so in my medical in my opinion my 120ml bottle of contactlense solution fals under "essential medicines" and I subsequently have the full right to take this through security.
I was questioned a couple of times in LGW but when I stated it was an essential medicine since my medical presribes the wear of contact lenses they backed then. Had a PH test a few times but they dont bother with that anymore either, maybe this would work for you too?