Update

In my essay German intelligence on operation Overlord the paragraph

Another German agent in Lisbon said in May 1944: ‘the plan of attack favored by the Allies was an assault on La Manche (Cherbourg) peninsula.’ [Source: ‘British intelligence in the Second world war’ vol3 part 2, p61]

is replaced with:

From Lisbon the agent Paul Fidrmuc sent a report correctly identifying the endangered area ‘the plan of attack favored by the Allies was an assault on La Manche (Cherbourg) peninsula’. According to his postwar interrogation he got this information from his agent ‘TOR’ in the UK.

 

[Sources: ‘British intelligence in the Second world war’ vol3 part 2, p61 and KV 2/198 ‘Paul Georg FIDRMUC, alias FIDERMUTZ, RANTZAU, codename OSTRO’]