Official Flying with Phonics lowercase to uppercase match cards.
 
Print, laminated and use with whiteboard pens.
I bought some wooden captial letters from The Works for £2. You can get wooden letters from Ebay or Amazon.
 
I then get the children to match the uppercase letter to the lowercase Flying with Phonics letters. Under each one is the 'write it' section. The children can then use a whiteboard pen to write it.