I am hoping that somebody can help me fill in the gaps/ unravel the following

On 3/8/45 two Spitfires collided in mid air during combat practice

One was an LFIX MJ411 and the other is unkown to me

One of the pilots was W/O Thomas Jeffery (killed) and the other was W/O Henry Scall (baled out)

At http://www.spitfires.ukf.net/ MJ411 is shown as being with No. 1 Sqn which could match it to Jeffery who according to CWGC was also with No. 1 Sqn. I do however have other information (original source unknown to me) which has this a/c with CGS at Catfoss and flown by Jeffery.

I also have conflicting sites for the crash location of the aircraft. The aforementioned site shows Hutton Cranswick (the base for 1 Sqn at that time) but 'just off the end of the east runway at Catfoss' has also been given.

It seems unlikely (although I don't rule anything out) that each of the aircraft returned to crash at its home station

Any help in identifying the second aircraft, placing the pilots in the correct seats and determining the two crash locations would be much appreciated.

Many thanks