I am sorry to hear it was a friend in the Towcester accident.
We have removed the Russian radio and ADF from the back of the aircraft, and replaced them with some flate metal plates. This allows us to see down to the tail clearly. We also have a policy of making sure passengers have empty pockets, and we wear flying suits, not for show but because of the zipped pockets, and a knee pad to write on. We also check the aircraft for FOD before and after each flight.
After the ceconite bulhead had been fitted, I removed the side panel at the tail, and felt around and found screws, and bits of tie-wrap. You would have thought the maintenance organisation would have made sure there was no rubbish before putting in the bulkhead!