It is very easy: just buy what you require and when finished go to checkout. The e-bay system will allow you to combine your order and then apply the postal discount for you. If you have any problems just ask for a combined invoice before paying and I will send you one with a link. The P&P discounts apply for invoices combined prior to payment only. The seeds will be sent via Royal Mail first class, packed in resealable bags with clear name of the variety and will arrive in a padded envelop!