As for the airside sales ... Based on information I've read in the British press (mainstream press, not tabs or blogs), I believe that the reason they are 2-stepping on this right now is that at least one of the persons arrested in this plot was the holder of an all-access pass at Heathrow; he was an airport authority employee. I think that the fear is that there may be others like him, and that one of these insiders might have hidden a tampered bottle of something airside somewhere. Until they have had sufficient time to go over every inch of every airport with a fine-toothed comb, they are going to try to err on the side of caution.
Now, this is just speculation on my part, but I think that what will happen is that all stocks of liquids or creams that are currently in airside stores will be taken out and replaced with versions that have special airport-only packaging, and that once those are available, you will once again be able to buy products airside and carry them on if the seals are intact. Duty-free is TOO big a money maker to be discontinued.
Reuters is reporting that among the items they found in the raids was a bottle for a Gatorade-type drink that was still factory sealed at the top, but had been altered to have a false bottom halfway down, so that the person carrying it could show that the seal was not broken, or even open it and drink from it, without ingesting the contraband substance. The presumption is that the volatile chemical would be colored to match the rest of the contents. To catch something like this, you would need for the bottle to NOT have a band-type label that could conceal the air gap in the center, which is not the case right now with almost any plastic drink bottle.
Contact solutions bottles are mostly opaque. I think that the packaging will have to be changed before they will be allowed back on aircraft. Overall, I'm thinking that this is a good time to invest in the consumer-products packaging industry.