Here's an interesting snippet that you may not be aware of. On Monday 5 October 2015, Royal Mail introduced a new surcharging structure for letters and parcels where insufficient postage or no stamps have been attached.
Letters/Large Letters - insufficient postage paid, the previous surcharge was the cost of the under-payment plus £1.00 handling fee. So if you received an item that was only 1p under-paid you would have to pay £1.01 before they would deliver it to you.
The cost for this service is now a £1.50 flat fee. So if you now receive an item that is only 1p under-paid you will have to pay £1.51 before they will deliver it to you.
And the cost for under-paid parcels is even dearer.
The phrase Robbing B******* springs to mind - But I'm too much of a gentleman to say that.
So be very careful what postage you put on your items, as it could cost the recipient very, very dear indeed without a doubt.
Keep on smiling through the pain. LLAP, Eric. 😠 👹