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According the AAIB report:
"The fuel crossfeed valves indicated that they were closed and they had not been operated during the flight."
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The report says the above up to the point of 780feet on the APP.
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I thought I read in the distant past that post landing the valve switches were found in the open position, one valve was open and one valve was closed.
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My thinking is about the 7 or 8 seconds between lack of thrust events, if one of the fuel manifolds had its problems and cross feed valve/s were opened then just may be the problem was allowed to move about.
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Am sure some posters will know where the comments about the cross feed valves are...please post if found......thanks.......