Amazin,
The packs sent out were not the commercial packs, but specially prepared packs for the GW giveaway. which I guess is the reason they contained 5 seeds instead of the 'minimum 10 seeds'.
They even had a disclaimer on the back absolving the BBC from any responsibility for the seeds, fair enough I guess, although I would have been slightly concerned about if I had paid £3.80 for them!
Steve