London made inventions

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Across
  1. 2. - Watson-Watt's invention. Won the Battle of Britain before a single plane took off. (5)
  2. 3. - Cooke and Wheatstone, 1837. The Victorian internet. (9)
  3. 4. — Berners-Lee's idea. First proposed in London, now contains everything. (3)
  4. 5. — Fleming's accident at St Mary's. The mould that changed medicine. (10)
Down
  1. 1. — Named after a fruit. Now in 60 million machines worldwide. (11)
  2. 3. - Parsons, 1884. Still powers most of the world's electricity. (7)