I call my dad "Dad", a girl can call her dad "daddy" at any age if she hasn't seen him in a long time and is greeting him with a big hug, or if she is trying to get something from him. A boy will call his dad "daddy" until he is about 7 or 8 then will from then on always say "dad". I don't know if this is different in different parts of the UK, I come from the South-West.

I almost entirely agree with Klippan, although I have heard "Daddy" used a little more widely than he suggests, and I have come across "Father", but it is not at all common as a term of address.

To answer your question directly, though, I would say that "Papa" is pretty well obsolete here.

Oh phooey, that is not what I wanted to hear at all. I guess I'll go with dad then.

@Joe W

I'm not offended or anything but I'm not a boy, I'm a girl. I recently called my Dad "Daddy" as I greeted him when I went home for Christmas after not seeing him for 3 months.

And another affectionate term in German for Papa is 'Paps' . . .

Usage like Daddy in #1 by Klippan . . .

And yet another term is 'Vati' . . .

I've heard "papa" as a term for grandfather in some cases in the U.S., but I don't know if it is really common.
Another form of "Papa" is - of course - "Papi"...especially in Switzerland, wehre most of the (smaller) children call their parents Papi and Mami.

Some of my cousins call our Grandpa "papa", we come from the UK

Actually, I don't think "Papa" is entirely obsolete in Britain, though I suppose it is a bit of a class marker, as only upper-class children (even grown ones) would use it. At least that is my guess. Just as upper class Germans would tend to use Papa (with long a's), whereas other might say Pappa.

my sons refer to me as "Vatter" (as included in "Gevatter") - but that could well be a matter of regional or dialect use. My (grown-up) daughter continues to call me Pappa. The only time I ever heard a Brit using "Papa" was a noncom addressing his unit's catholic chaplain.

My husband and his siblings call his mother (now 90) "Mutti". This was introduced after my husband went on a German exchange when he was 14! She is never called Mum or Mummy now.

Just as upper class Germans would tend to use Papa (with long a's), whereas other might say Pappa.

Ich wage zu bezweifeln, dass das mit der Klasse zusammenhängt. Wohl eher Idiolekt/Dialekt/Regiolekt.

I'm born in the Ruhr area and called my father Vadder when I was a child and later Vater. My children call me Vater, my grandchildren Großvater. We never called each other Papa, Paps,Opa etc. though it is more popular and of widespread use.

@Selkie: the best word would depend on the class and sex of the speaker, and whether talking to or about him. "Dad" is neutral and safe.

I decided to leave Papa in, since it was a German woman referring to the artistic creations of her father. But thank you for all the suggestions.

@ selkie

If you are suggesting you are talking about someone who is referring to his/her father then I think you would not say my papa has/is .... (unless you are talking to someone you know), the usual way would(in my humble opinion) be to say my father has/is....

Have a nice day

No, LFC-YNWA, thank you for trying to help, but I was not. I was referring to a line of text about a young German woman who sells, among other things, "Papas Kreationen" as they are called in the German text. I was dithering about whether to change it to "Dad's creations," but decided against it and left it as Papa, since it would not be misundertood but was authentic to the origional.