[2b3a51]

UK is private enterprise rather than Royal Mail

https://www.photowire.uk/

One example I just found. £2 to address in UK and £3 international.

A thought has crossed my mind: if these kinds of site are quite common across the world and charge lower rates for sending cards within their local country, perhaps there is an opportunity for someone to set up a central Web site that finds you a local service? Add a small percentage?