My husband and I are going to Scotland in 2 weeks and are trying to go carry-on only - no checked bags. The snag we've run into is that his contact lens disinfecting solution, AO Sept, does not come in travel sizes. Theoretically, TSA allows eye drops & saline solutions, but from what I've read online some agents will not permit hydrogen peroxide disinfectants like AO Sept to go through. And I've also read that rules are even stricter in the UK, so I'm concerned that even if we got through US security, we might not get through English security. Has anyone had any recent experience with this?

You can buy it in the UK I believe. What you don't use you can throw before your flight home.
If you can't find AO Sept then look for Clear Care which is made by the same company.

It is sold in the UK

just one source -- Boots is <i>everywhere . . .

http://www.boots.com/en/AOSept-Plus-360ml_1144000/

There's also Sauflon One Step, which is the same kind of thing. In Glasgow we had to go to an optician to buy this. Fortunately he was open Saturday mornings.

contact lens solution doesn't have to meet 3 0z. guideline.

"To ensure the health and welfare of certain air travelers, in the absence of suspicious activity or items, greater than 3.4 ounce (100ml) of the following liquids, gels and aerosols are permitted through the security checkpoint in reasonable quantities for the duration of your itinerary (all exceptions must be presented to the security officer in front of the checkpoint):

Baby formula, breast milk, and juice if a baby or small child is traveling;
All prescription and over-the-counter medications (liquids, gels, and aerosols) including petroleum jelly, eye drops, and saline solution for medical purposes;"

http://www.tsa.gov/311/311-carry-ons.shtm

Thanks for the advice. The hydrogen peroxide is going to be problematic, so it looks like the best solution is to either check a small bag or try to find a Boots near the Edinburg airport & buy when we get there. Thanks, everyone!

"<i> or try to find a Boots near the Edinburg airport & buy when we get there</i>"

There is a Boots IN the Edinburgh Airport (and probably every other airport in the UK). Actually I think there is more than one Boots at EDI.

DebitNM: US TSA does allow it, but w/ a connecting flight into EDI there is no guarantee UK security would.

Oh meant to add . . . assuming you are connecting through LHR, there are Boots in every terminal there. You can buy it after security and take it on board the flight to EDI.

Oh, I forgot. Clear Care does come in a travel size; I bought it at Walgreen's. So if you take that, it'll last you a few days. If you take two, they'll last you the whole trip. (I always put my quart bag "overflow" in my husband's.)

Boots Pharmacies are so ubiquitous in the UK they make McDonald's restaurants in the US seem sparse.

Sorry, I didn't read the OP thoroughly enough.

Thanks again everyone. Janisj, your posts on many topics have been so helpful in planning this trip.

I had no problem traveling with my full-sized contact solution when flying into Belfast, which is a UK airport, a year ago May. And yes, Boots are EVERYWHERE.

If you are flying into Edinburgh, the Boots is airside so go there first. Not sure about Glasgow.