Two. Incidentally, the report refers to the designs throughout as P 79. There are 17 designs in total, though there must have been a few more since one or two have an 'a', 'b' or 'c' after the number. So P 79/10c for example. There isn't a P 79/51 - that seems to have just been a mistake. What's usually given as P 1079/51 is actually just P 79/17, the last one.
What strikes me most is the apparently detachable cabin and the telescope gunsight. Is this identified? The bomb I cannot recognize due to its ellipsoid shape and tail (no tail ring?), somewhere in the 500 kg range?