Due to a mistake (for which I'm likely to be the culprit) when compiling
lists, one cohort ((L2(7) on 21 points)^2 in product action) has been
omitted from the primitive groups library.
(Note that this library does not come with a guarantee of completeness for
the groups of degree > 50.)
The three missing groups have been added to the library at the end of degree
441, which now contains 24 groups. They will be added with the next bugfix,
if you need these groups urgently now, please send us an email and we will
provide you with a temporary workaround.