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Batey, Keith 22, 44, 51, 52, 60–61, 70–71, 73, 74, 80, 87–88, 92, 167, 170, 195, 196, 220, 289, 290, 297, 308, 310

Batey, Mavis (see also Lever, Mavis) 6, 14, 21, 22, 23, 44, 47, 50–51, 57, 60, 80, 86, 87, 119, 126, 131, 132, 133, 151, 169, 195, 196, 242, 258, 274, 275, 292, 301, 302, 303, 308, 309, 310, 319

Battle of Britain 6, 98, 99, 100, 107, 108, 109, 120

Battle of the Atlantic 83–84, 87, 120, 130–136, 139, 177, 186, 191

BBC 252, 280, 281

Bennett, Ralph 182, 188, 273

Berkeley Street 179

Bertrand, Gustave 43, 44, 45, 46, 47, 213

Bigram tables 84, 100, 132, 133

Birch, Frank 13, 40, 85, 100, 133, 189, 190, 229, 230

Birley, Maxine 122

Bismarck 113, 135, 136

Blitz 6, 109–110, 111, 116, 120

Blunt, Anthony 230, 233, 235, 237

Bombes 54, 78, 84, 92, 94–106, 148–150, 154

Bourne, Ruth 37, 102–103, 136–137, 165

Bradshaw, Commander 28, 104, 251

Bridgewater, Bentley 61

Briggs, Asa (later Lord) 137, 211, 302

British Tabulating Machine Company 95, 223, 267

Britten, Benjamin 14

Broadway Buildings (MI6) 10, 23, 41

Brooke-Rose, Christine 209

Brown, Gordon 298

Brown, Tommy 192

Bundy, William 207

Burberry, Elizabeth 198

Burgess, Guy 230, 239

Cairncross, John 229, 230, 231, 232, 233, 235, 236, 237, 238, 248

Calvocoressi, Peter 34, 75, 107, 129, 166–167, 208, 209, 227, 235

Chamberlain, Neville 11, 12, 52, 97

Chatham intercept station 55–56, 57

Chicksands 200

Churchill, Winston 33, 39, 97, 98, 99, 107, 108, 112, 113, 114, 115, 116, 117, 156–163, 174, 178, 188, 189, 202, 203, 213, 232, 233, 234, 239, 241, 243, 270, 274, 312

Clarke, Joan (also Murray, Joan)

Clayton, Eileen 38, 89, 90, 109, 114

Clyde, HMS 177

Cohen, Jon 197

Colussus machines, 87, 259–271, 283

Copeland, Jack 45, 83, 100

Cooper, Josh 11, 14, 15, 39, 53, 70, 89, 90, 91, 119, 120, 126, 144, 152, 189, 304

Coventry, the bombing of 107, 112–113, 114, 117

Crete 134

Cripps, Sir Stafford 234

Cunningham, Admiral 131, 132

D-Day 6, 272–274

De Grey, Nigel 14, 31, 32, 34, 46, 172, 173, 178, 180, 209, 222, 223, 224, 226

Denham, Hugh 185

Denmark Hill (intercept Station) 57

Denniston, Alistair 12, 13, 16, 18, 19, 20, 21, 22, 23, 31, 38–39, 40, 45, 48, 51, 59, 77, 78, 82, 85, 86, 123, 133, 143, 144, 151, 152, 160, 178, 179, 181, 182, 204, 205, 206, 257, 259

Dollis Hill (P.O. research unit) 206, 261, 266, 267

Dolphin key 177, 186

Donitz, Admiral Karl 176, 177, 182, 187

Dryden, Henry 231

Eastcote 101, 165, 283, 288

Edmonston-Lowe, Lucienne 247

El-Alamein 6, 188

Elizabeth, HRH Princess 128

Enigma, breaking of 18, 20, 41–48, 50–51, 56, 58, 68–69, 73–74, 75, 79–81, 94

Enigma, invention and development 41–43, 44

Enigma, descriptive of machine 5, 41–48

Enigma, descriptive of technical aspects 41–43, 45, 48, 94

Ettinghausen (later Eytan), Walter 136, 310, 311

Fasson, Lieutenant 192

Faulkner, Captain 10

Fawcett, Jane (MBE) 8, 61, 135

Fensom, Harry 264, 265, 270

Fish code (see Tunny)

Fleming, Ian 7, 242, 243

Flowers, Dr Thomas, 259, 261, 263, 264, 265–266, 267, 268, 269, 270, 271

Foss, Hugh 42, 43, 184, 196, 204, 246, 247

Friedman, William 206

GCHQ 129, 286, 309

Gallilee, Mimi 27–28, 31–32, 52, 53, 65, 66, 67, 68, 108, 127, 137, 141, 144, 145, 172–173, 179, 201, 209, 217, 218, 247, 248, 249, 288, 289, 304, 305, 309, 311, 313

Gielgud, John 296

Giraud, General 213

Gleaner HMS 84

Gores, Landis 34

Gorley Putt, S 8, 195

Government Code and Cypher School 9–11, 13, 15, 18, 19, 23, 41

Grazier, Colin (Able Seaman) 192

Halfaya (Egypt) 134

Harris, Robert 216

Henniker-Major, Osla 1, 3, 25

Herivel, John 16, 26, 35, 42, 46, 47, 50, 53, 55, 56, 68–69, 79–80, 159, 160, 282, 288, 308, 311

Herivel Tip 26, 68–69, 79–80

Hess, Dame Myra 246

Hilton, Peter 16

Hinsley, Professor Sir Harry 6, 23, 49, 73, 74, 81, 98, 173, 178, 187, 198, 272, 274

Hiroshima 281

Hitler, Adolf 24, 41, 43, 52, 97, 99, 108, 109, 233, 234, 263, 277, 278

Home Guard 164, 170

Hyson, Dorothy 7, 72, 306

Ismay, General 138

Italian Enigma 48, 119, 131, 132

Japanese codes 42, 58,