S.F.L.Y. - the a/c was at Vref 135 kts, on a/p, on g/s, when the engines reduced to a power setting less than demanded but slightly above idle.
Obviously the a/c slowed. At approx. 115 kts the flaps were retracted from 30 to 25.
At approx. 105 kts, with no more airspeed to sacrifice to stay on g/s, the a/c started to sink below g/s and the a/p disconnected. Speed stabilized at approx. 100-105 kts.
The FDR readout is on page 6 of this report -
http://www.aaib.gov.uk/cms_resources...m%20Report.pdf