Birthday boy

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Across
  1. 3. Food from Grasmere
  2. 6. Mr Benn's anniversary
  3. 10. Adores a stone circle [anag]
  4. 12. Said "if you want to master something, teach it"
  5. 14. 23 June, every year
Down
  1. 1. Nickname at Uni (ctrl alt delete)
  2. 2. Elated
  3. 4. Circuit designer, maybe
  4. 5. "Put some spirit into it" sumo phrase
  5. 7. System design principle [acronym]
  6. 8. La Serenissima
  7. 9. Wallace's mechanic
  8. 11. F1 backward, according to Murray
  9. 13. Father of radar minus the power
  10. 15. Bright fame