Design Your Own Birthday Cake London Cake Personalisation?

London cake personalisation? - design your own birthday cake

Ok. My mother wants my uncle, a birthday cake for his birthday.
We live in Bristol, he lives in London.
And we see all the time.
Then she wondered if a site that you can customize / design your own cake, or add a name or number of one of his cakes and he gets to London.
Is there a site online where you can make / choose the cake you want and do it and send it to him.
If you are in London - this is perfect!
Thus, any website and / or phone number is .....