BOAC,
The question remains now what happens if the reversers do not unlock? Are the RCL's locked 'inop'?
In Novosibirsk 2P managed to break RCL lock by force.
From T204 overrun at Novosibirsk thread at aviaforum:
in short: TL at Idle, RCL - small reverse, no wow signal from left strut, so reverse switching is locked, reverse flaps not shifted, engine on direct thrust, PNF pulls hard on RCL to the full revers and having uncommon physical strenght managed to force levers forward thus put engine (praise to the creator only one) on the regime close to the nominal. F/E doesn't notice nor reverse switching nor increase of the thrust when throttles in idle, PF is busy pressing on all possible brakes, incl parking and starting, which leading to the destruction of the wheels, etc.
Lucky they there was was not a fence or a concrete wall in front of them...