I know it's a huge undertaking and would be quite large project for someone, but the case for a Heathrow airport scenery is compelling ...
1. Most airlines represented in AFS2 either fly from or to Heathrow, e.g. A320, 777, 747
2. The recent UK freeware project (ortho & cultivation) provides for a base scenery for the surrounding area.
3. It is central to all the existing payware & freeware scenery.
So how about it scenery developers, lets give Heathrow the attention she deserves ...