India Four Two #152... the double triangle or 'Star of David' runway pattern evolved because Middlesex County Council would not or could not move the Perry Oaks sewage plant to permit the E-W runway to run through the middle of the site....accordingly the main runway was laid much closer to the A4 road (the 09L/27R we have now, corrected per DaveReidUK) with crosswind runways 23/05 and 34/16 making up the first triangle....the second inverted triangle allowed a second E-W runway to pass to the south of the sewage plant (the latter finally removed a half century later to permit T5 construction.)
Last edited by A30yoyo; 28th Nov 2016 at 10:11.