SOP was full reverse coming over the fence, as was the case for other short fields it operated into.
IIRC (after 38 years) for short landings reverse
idle was selected during the flare, then increased as required after touchdown.
He recounts a jump seat trip he made to Oslo during the last month of BA Trident operations (December 1985), where the boost engine was used not just on the return leg (where it was essential in the Norwegian winter) but also on takeoff at LHR to confirm its serviceability
I recall a winter departure from OSL when the boost was required for contaminated runway perf. The boost started OK but failed on spool up so we taxied back to the gate and offloaded enough pax (more than half of them IIRC) to reduce the RTOW to achieve no-boost perf.