Secret War in Portugal [1939-1945]
For SOE [British Special Operation Executive] 24 Land was the code name for Portugal

Leslie Howard lectures in Lisbon

I found a press cut concerning the two lectures de made un Lisbon. Here they are, published by  O Mundo Gráfico, the anglophile magazine directed by Artur Portela (father). Above a photograph of him and Dr. George West, from the British Institute, surrounded by journalists.
P. S. Professor Douglas Wheeler, a good friend and a most respected researcher on LH's fate, wrote me saying that Dr. West is not in the picture. I quote the mention from the original press cut, as it can be confirmed clicking above in the link. But I do trust in Professor's remark and remian most grateful for it.