How do I add a middle name?

[MolotovCocktail]

I would like to add a middle name to my 4yo and 15mo dd's birth certificates. Both don't have middle names. Dd1 would like one, which means dd2 has to have one, too!

How do I go about this in the UK?

I forgot to ask: does anyone know how much it costs?

I think your only option is deed poll. Many companies do it online or less than £30 and it really straight forward to do.

A girl I went to school with (and her brother) were told they were allowed to "pick their own" middle name as their 16th birthday present which I always thought was interesting!
If your dd1 is picking hers, maybe let dd2 wait and pick her own as well?

*for less than

Thanks jay that's really good to know. Thanks for your reply :)

The name for dd1 is one that I chose at the time of her birth, but was not put on her BC. The subject of middle names has arisen amongst her friends; the inevitable "why don't I have a middle name, Mummy?" has been asked. I told her what I would have had as her middle name and she loves it :)

I could wait and let dd2 choose/approve/disapprove of the middle name I have in mind for her. I'll definitely look at Deed Poll for dd1.

Thanks again x