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I worked on BAC 1-11 when the HS146 was launched & I assure you the baseline aircraft was definitely the HS681 - the reason for the 4 Lycomings is that the blown flap needed 4 jets to replace the twin peggies (think QSTOL Buffalo).
Er, no.
If there had been any carry-over from that generation of military VTOL aeroplanes, it would have been from the DH129 not the HS (né AW) 681 as the 146 was a Hatfield product .
The progression from DH126 small feederliner via the HS136 rather less small one (with RR Trent engines - no not the later huge ones, nor the earlier turboprop ones!) and other project aeroplanes to the AVCO-Lycoming powered high-wing 146 was the result of shifting targets for size, range and complexity being matched to shifting availability of suitable power units.
The 146 has not and had not blown flaps. The flaps are behind the engines, and there is doubtless a bit of fan-induced extra velocity but blown flaps as normally understood are very different.
The 146, although the most numerous British-built airliner, seems to be very poorly understood if this thread is anything to go by.
