BW
Numerous reasons given but the main ones seem to be
1. Difficult & time consuming to construct due to topograpghy of land to east of runway.
2. Massive amounts of landfill required. Estimated at 1.14million lorry trips through country roads causing severe enviromental problems.
3. Lengthy runway closures of r/w so day to day ops badly affected.
4. Major stand & terminal construction on old landfill site east of delta taxiway.