1939 BEF 'blacked out FPO and censor numbers

[Jim Etherington]

I have a number of these covers addressed to countries other than the UK with the blacked out FPO and censor numbers.

Am I correct in assuming the postage stamp represents the required postal rate for members of the BEF serving in France to send mail to foreign destinations?

This particular cover has the stamp franked with an unusual cancel. Can anyone shed any light on it?