Well the Union Flag has to feature on an A to Z of Britain, this design simply drops a U on top of a section of the Union Jack as I have always known it.
The Union Flag 10p coin can be found in your change, coins entered circulation dated 2018.
The Royal Mint released the Quintessentially British A to Z coin 10p collection in March 2018, with first strike U for Union Flag coins sold online for £2 each, or on a card from The Royal Mint shop for £4.
There is also a Union Flag 2018 UK 10p Silver Proof Coin available, priced at £35 (6.5g of .925 Sterling Silver in a capsule) or presented in an Acrylic Block at £45 (Limited Edition 15,000)
You can store your letter U 10p with the rest of the alphabet in the Great British Coin Hunt 2018 10p Coin Collector Album.
There is also a Great British Coin Hunt Silver Proof Case that can be purchased for £45, but you will need to spend £910 (£35 x 26) to fill it.
If you want to display a selection of 10p letters, for example to spell out a name, the Great British Coin Hunt Name Frame is available in black or white for £20 and holds up to 8 coins.