The London Underground wants to harness heat accumulated to help warm hundreds of homes. The project, which is the first of its kind in Europe, could even help reduce spiralling energy bills.
Dan Hewitt reports:
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Fighting for their right to misuse nitrous oxide, approximately 60 or 70 protesters inhaled 'laughing gas' amid concerns over a clampdown.
The pilot, from the Gnat private display team died after the display aircraft he was in crashed near the CarFest event in Cheshire.
The annual cycling festival in London was the biggest ever this year - with more than 25,000 taking part today.