There was a programme on TV in the last few days which said that there was only about 50 Grand Slam made as very expensive.
If the aircrew could not see to drop the bombs over the target or had to return to base for some reason they were not to jettison the bombs as was usual, but bring them back for another flight.
It appears that the runways had to be reinforced to take the loads imposed by the returning aircrafts weight with the 10 ton Grand Slam. The Tallboy was nearer 5 tons.
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