But how can a flight like Gatwick to Brindisi exceed the aircrafts MTOW?
I am sure someone with greater knowledge than I will be able to answer this, but when I worked at an airport MTOW would sometimes be exceeded if runway temperature increased above the expected, if weather conditions changed suddenly causing extra fuel uplift to be required, or fuel supply down route problems meant having to tanker. Or simply, a c*ck-up! It happens.