for the record, lets put some estimates on the board
bernie was worth at least 3'26.00 seeing as he ran 3'26.3 with a 53 finish - pace to bell had been far too slow - you shoud only manage ~ 55.0 last lap if pace was right ( he probably was worth even quicker, maybe 3'25.75 as he got balked when speeding up on last bend )
anyhows, 3'26.00 is good enough to work with
use various hypothetical 400s for him & some common sense/experience
trying
http://www.jundo.co.uk
3'26.00 with
50.00 -> 1'45.17 , 2'13.55 , 7'11.40 , 12'22.84 , 25'50.35
49.75 -> 1'44.94 , 2'13.36 , 7'12.39 , 12'25.68 , 25'59.32
49.50 -> 1'44.70 , 2'13.17 , 7'13.37 , 12'28.53 , 26'08.30
49.25 -> 1'44.46 , 2'12.97 , 7'14.35 , 12'31.38 , 26'17.27
49.00 -> 1'44.22 , 2'12.78 , 7'15.34 , 12'34.22 , 26'26.24
48.75 -> 1'43.99 , 2'12.59 , 7'16.32 , 12'37.07 , 26'35.21
48.50 -> 1'43.75 , 2'12.40 , 7'17.30 , 12'39.92 , 26'44.18
48.25 -> 1'43.51 , 2'12.21 , 7'18.29 , 12'42.76 , 26'53.15
the "goldilocksomometer" tells us that looking at the overdistance to 1500, especially most "sensitive" gauge, the 3k, that these times are too "hot" & therefore by implication the 800 times are a nonsense & that no 3'26 guy can have anything worse than 48.25 speed ( if running 400s regularly )
moving on :
48.00 -> 1'43.27 , 2'12.02 , 7'19.27 , 12'45.61 , 27'02.12
47.75 -> 1'43.03 , 2'11.82 , 7'20.25 , 12'48.46 , 27'11.09
47.50 -> 1'42.80 , 2'11.63 , 7'21.24 , 12'51.30 , 27'20.06
looking at that, the "porridge" looks just right fahrenheit at 47.75, with slight leaning towards 47.50
therefore 1'42.90 - 1'43.00 looks the number
further on for completion
47.25 -> 1'42.56 , 2'11.44 , 7'22.22 , 12'54.15 , 27'29.03
47.00 -> 1'42.32 , 2'11.25 , 7'23.20 , 12'57.00 , 27'38.00
46.75 -> 1'42.08 , 2'11.06 , 7'24.19 , 12'59.84 , 27'46.97
porridge far too cold here