MMB is doing this to me for a LGW-BLQ-LGW journey, where BLQ-LGW has now become MXP-LHR in LH C (thanks BA) as the return is on a strike day.

May be more of the "N/A"s about at the moment due to the strike. Should get full miles and tier points for cancelled flights and rerouted flights including flights on another carrier. They probably have to do most of this manually - hence N/A until some one sorts it.

When I have been rerouted by BA on to another carrier (in that case SAA), miles and tier points did post, but I'm not holding my breath this time. Could be more like the downgrade for everyone from CE to Y at Christmas - lot of phone calls to get CE miles and tier points posted.