It is a bit of a tricky topic and takes some research and a lot of reading to make sense of it
The patent is registered with the US Patents office but there is no registration with the UK office. You could make these in the UK but are unable to sell them to the US. However the word Taggie is Trademarked which is worldwide so you are unable to call them Taggies or even call them Tag blankets.
If you can find and read copies of the cease and disease letter that the owner of Taggie sends out it refers to the US patent of the design and the worldwide copyright/Trademark of ‘Taggie’
Its a shame that they were even allowed to have a patent on ribbon folded between 2 pieces of fabric. For a long time these have been made by mums from labels out of clothing attached to blankets - once called ticket blankets. I believe Fisher Price even made similar products in the past.
As for the safety aspect as with all products that have play value and are aimed at children under the age of 14 they should be CE marked in accordance with The Toy Safety Directive
Hope this helps. x