Contrary to the childhood fantasy, digging straight down from England **won't pop you out in Australia or New Zealand**. You'd hit **ocean**—specifically, the **South Pacific**, southeast of New Zealand.
Australia spans ~10°–40° S. England's antipodal latitude is **~51° S** — the **"Furious Fifties"**, roaring westerlies, no land. The only land near 51° S: **southern Chile/Argentina (Patagonia)**, **South Georgia**, **Antipodes/Campbell/Auckland Islands (NZ)**. England's longitude (0°) puts its antipode at 180° — the **antimeridian**, mid-Pacific.
That's Earth's **circumference** (equatorial). The antipodal distance (through Earth's center) is **12,742 km** (diameter). The surface distance *along the curve* between antipodes is **20,037 km** (half circumference). The original answer confused these.
Only ~15% of land has land antipodes. **England's antipode is ocean.** So are most of Europe's, Asia's, and North America's. Dig from **Madrid** → **Webber, New Zealand** (one of the rare land-land pairs). Dig from **Shanghai** → **Concordia, Argentina**.
So: grab a shovel in London, and you'll surface in the South Pacific—wet, windy, and very far from a pub.