All the postcards below incurred postage due for different reasons (two which had the same reason are displayed together).
The postcard below from Bridgwater to Ilminster in June 1921 has a large 1d postage due mark and postage due stamps. The 1d postage due mark is currently known used from 1903. The Postcard Rate increased 10 days before the postcard was posted so the postcard was insufficiently franked.
The next postcard is from Porlock in 1930 and was posted without a stamp. It has 2d charge marks from both Dunster and Taunton and a postage due stamp.
The next two postcards, sent in March 1905 to the same addressee from Taunton, both had glitter on the picture side (not allowed at Postcard rate, only at Letter rate).
The final postcard, sent from Taunton in 1930, incurred postage due because the postcard was a novelty one with an opening with pictures and had more than 5 words of message. This meant that it needed to be paid for as a Letter rather than Printed Matter (which was the same rate as Postcards).