At wars end the following RAF squadrons were flying Spit XIVs: 453, 414, 222, 430, 130, 610, 41, 268, 350, 401, 2, 451, 412, 322, 215, 402, 91, 403, 322.
He also forgets about the serious German fuel supply problems in 1945. C3 was required by the 190s. C3 was required for 1.98ata boost by the 109s.
"As for the fuel supply, I own copies showing detailed stockpile status for February-April 1945... But yes the C3 was definitely scarce.
As of March 1945 only a handful of 109 gruppen were using C3 for their mounts, one of the few being the II/JG11 which were responsible for testing the 605DB/DC over January-March 1945. According to a document dated late January 1945 coming from DB the 1.80 had just been cleared following serious troubles (pre-ignition) reported by the unit testing the 1.80 ata boost. It is also noted that following the clearance of the 1.8ata boost the 1.98ata operational tests could now begin but with concern about the sparkplugs thermal resistance IIRC. C3 was not used by 109 units until the 1.98ata boost was cleared, they relied on B4+MW-50 so that C3 could go to the 190 units. And even after the clearance only few gruppen got it because of shortages due not only to C3 production but also to C3 delivery to the units.
AFAIK 1.98ata boost was cleared late February but it seems to have been slowly introduced into service, I suspect the adjustments needed on the engine and the change of sparkplugs type (supply problems ???) took longer than expected. From other documents I know that C3 and B4 had severe quality problems beginning in late 1944. While it was not much of a problem with low boost, it had some serious effect on higher boost, so it might also have slowed down the introduction of 1.98ata boost. At least DB documents underlined the need for cleaner fuels than those in use at that time. You can safely assume that by March 1945 1.98 ata boost was being introduced, unfortunately I do not have much details for April 1945, but I doubt it would have changed much, given the situation."
He tries to imply that all of II./JG11 was testing at 1.98ata but he say only one staffel (11 a/c) was on strength in Jan 1945 that had K-4s. The LW had only 79 flyable a/c (6 staffels) in April 1945, some of which were Gs, while there was 19 Spitfire XIV squadrons.