I hadn't yet received our commercial Kings seeds catalogue, which we use to buy larger packets or bags of loose seed from which I make up '50p' envelopes for our association. We've done it for quite a few years now.
For some of the seeds, I weigh them out in fractions of grammes, but for other seeds it's a seed count. Beans and courgettes in particular have had to decrease in seed count over recent years in order to continue to make any profit.