Question to the Department for Transport:

To ask the Secretary of State for Transport, how many incidents have been reported of (a) material falling from planes and (b) landing on property under flight paths in (i) the Heathrow area and (ii) nationwide in each of the last 5 years.

The DfT does not maintain a log of such incidents, however the CAA may hold some information pertaining to this which is available upon direct request from them.