As seen - 

Multiple purchases - One postal charge + 20p for each additional item purchased if all purchases can be sent in the same envelope.

To obtain this discount please wait for my invoice OR place all your purchases in the e-bay shopping basket before you press the buy now tab.   

Please note - I am unable to refund overpaid postage if you do not  follow the above guidance

May be necessary to fold 2 cm from left side to comply with Royal Mail regulations for International Letter Mail