Combined postage will only work if items are paid for in one transaction.
Pay highest postage cost and additional items will be delivered free. (UK only, due to weight of this item overseas charge will be £1 for each extra)
Add items to the 'shopping basket' first then ensure that all postage is set to the same class. e.g. make sure if you have upgraded to 1st that you set all your items to 1st otherwise you will be charged for 1st & 2nd.
If you think that it's wrong please 'request total 'prior to paying
Sometimes when using the app the P&P can be problematic. Please switch to the 'Desktop' page