"Gift" Derwent/Nene: US: 11 March,1941 Lend/Lease deal was to suspend patent/IPR protection in the greater interest, and to roll up who-owes-who what till Victory. When that was done in July,1946 (by Maynard Keynes on UK side) "Reverse Lend/Lease" was computed with $800K for all-things-Whittle, to arrive at a net number. The 1947 licence, RR:P&W for Nene, "the needle engine", and the 1948 one for Tay, as J42 and J48, were done on negotiated commercial terms.
USSR: in October,1946 Uncle Joe was not yet seen in the colours he later displayed. UK had a $ bridging Reconstruction Loan, but needed ongoing $-sparing sources of food and other material. GIs were onway home, all planned to be gone by November,1948 Presidential Elections. It seemed a good idea to be on good terms with our near-neighbour. 10 (later,30) Derwent (to be RD-500), and 10 (later,25) Nene (to be RD-45 & VK-1) were bartered (not a gift) for Ukraine grain. This is, clearly, an oops blunder in hindsight, given the subsequent Berlin Blockade and Cold (Korea, Nene/MiG-15: Hot) War...but a legitimate alternative history What-If has the whole East:West confrontation as avoided if US/UK had not tried to encircle/contain Joe. Why, for example, did B-36/(B-29D) B-50 and Avro Lincoln continue in production after VJ Day?