No idea who wrote this, especially now that Royal Mail has been privatised. A while ago I sent a book in the post to Finland from Britain. The book got stuck for 4 weeks in LOS ANGELES. Then I had to watch as the tracking bounced it around between depots on the west coast of America. Then somehow it got flown to Finland where it got stuck again due to post-Brexit customs issues. International shipping, even to countries a few kilometres from Dover is now handled by US Postal Service.
So even though you’re almost funny, you’re still taking sh*te.
The fact Royal Mail is privatised seems irrelevant since whoever you shipped with in Finland decides how it will get to the UK.
I order things like band merch from Europe and have never had a problem receiving in the UK.