I think it has been mentioned before, but
AFAIK this does not NEED to be an AAIB investigation and the company can sort it out, as has happened in other 'mishandling' events in other airlines.
Also need to correct some peoples' lack of understanding of 737 systems - there is no 'Alpha-Floor' on the beast. Select full power at low speed and do not control the pitch and those parameters are a doddle.