![NCSC UK on Twitter: "Our challenge to you on #WBD19 - how fast can you complete puzzle 221 on page 134 of the @GCHQ Puzzle Book II? Our best time will obviously NCSC UK on Twitter: "Our challenge to you on #WBD19 - how fast can you complete puzzle 221 on page 134 of the @GCHQ Puzzle Book II? Our best time will obviously](https://pbs.twimg.com/media/D1C_vLBWwAIAMlp.jpg:large)
NCSC UK on Twitter: "Our challenge to you on #WBD19 - how fast can you complete puzzle 221 on page 134 of the @GCHQ Puzzle Book II? Our best time will obviously
![The GCHQ Puzzle Book II by GCHQ: Very Good Soft cover (2018) First Edition, First Printing. | Washburn Books The GCHQ Puzzle Book II by GCHQ: Very Good Soft cover (2018) First Edition, First Printing. | Washburn Books](https://pictures.abebooks.com/inventory/30590719244.jpg)
The GCHQ Puzzle Book II by GCHQ: Very Good Soft cover (2018) First Edition, First Printing. | Washburn Books
![Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books](https://m.media-amazon.com/images/I/81cKxLXy9KL._AC_UF350,350_QL80_.jpg)
Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books
![Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books](https://m.media-amazon.com/images/I/71D0CXK0XvL._AC_UF1000,1000_QL80_.jpg)
Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books
![Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books](https://m.media-amazon.com/images/I/8156KTKqHFL._AC_UF350,350_QL80_.jpg)