I was thinking perhaps you have two cars since the thread title asked how to get gas out of a '98.
The '99 Civic ES Aerodeck (I had to guess which trim to choose) doesn't appear to have one.
You have to realize that most of the people on this site are based in the US, so when you say you have a Civic, we assume it's a Civic coupe, hatch or sedan. We don't have the Aerodeck or five door, which might as well be named something completely different than "Civic". Most of the world doesn't get the Aerodeck or five door since they are the rarest Civic body styles.
MOST COMMON
sedan
hatch
coupe
Aerodeck
Five-door
LEAST COMMON
It's okay though, because most people don't know what countries get each car, even if they're interested in them.
Since they do have cars that have the drain plugs in the UK, then I don't think one model not having the plug has anything to do with there being a law against it.