can I bring these items with me into the UK when I'm going for holiday?

So, I'm meeting up with friends in England and a couple have asked me to bring some treats for them. I agreed, without thinking that I might not be able too bring them but I'm pretty sure I can. Things they asked for are:

 A box of twinkies
Tootsie Rolls
Peanut Butter M&M's

Are these going to be a problem? I'm going to be bringing them in my checked luggage ... Just curious!! Sorry if theres already a post/thread about this already.

No problem. They are small items and you are not bring them in for resale.

Thank you !! Do I have to mention it in any way, on any forms? I know I get something on the airplane . . . but I can't remember what all I have to put on it.

No.  You dont need to mention them anywhere.