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DIO o. Mr Crud§# You will wish to know in confidence that those who are required to b« on duty 1 A the COBR is an eaergancy have been warned to be at a higher- thin-norcial state of readiness for the period 27 Way - 15 June. The Defence Secretariat will be providing you with a note to auppleaent your standing instructions on action in the event of a terrorist incident (J439 of 15 September 197$) but 1?hia i» unlikely to b« availabl uatil 27 May. In checking your orders, I note the following aoend&ents should be made notwithstanding supplementary instructions to follow. Anna* C Hose Office (Duty Officer) wef 8 June delete! 8}$ 4465 insert: 213 3611 Annex Delete all reference to Mr C J Aldridge Insert: Mr F R Caa^pbell 46 Ruskin Driire Orpington Kent Orpington (66) 29751 R J BISHOP 25 May 1977 CONFIDENTIAL