The answer I was going to write. Don't take them through the airport, take them through the mouth. And not with alcohol.
The other answer I was going to write. OMG. You can't even legally *own* them in the UK. Did you have a scrambler on your phone, and send them to a drop box with a fake name?
The answer. It is fine, don't worry. Kamagra is an Rx drug not an illegal drug. If you have any Rx drug, there is no rule that you need to keep a copy of the prescription. Also paying a girl to have sex with you after taking them is fine in these two countries. Perhaps not wise *in* the airport.