Whilst I continue to favour the probable causes as (in order) being:
- runway braking action/hydroplaning
- deep landing and/or
- higher than desired speed
- late reverse selection
there is one other possibility that could contribute that is so far unmentioned.
That is that they were doing a non precision approach as part of training - the wx reported on page 1 would not preclude it.
If they then forgot to 'Activate the Approach' [
easy to do on the bus on an NPA] and selected 'managed' speed at the OM/4d, the commanded speed would increase to 250kts. This would then be detected, but in the meantime would destabilise the approach, the extent depending on the duration of the speed increase.
Just for the sake of completeness and without knowing what NPAs are available.