Of course you can. How about you don't be lazy, weigh the item and then use the royal mail website to find out how much it would cost to post an item with that weight just like anyone else would have to do for you?
I'm afraid you are lazy.
I found this in three seconds with a Google search for "maximum size for royal mail packet"
Or are you using Bing?
I think he is asking if he can send the boogie bug in its original packaging, with no outside packaging.
I have no idea.
You can send anything you want and it doesn't have to be covered up.
The idea is that it's covered up so nobody can see what it is (or thieve it).
Up to you.
It would be a good idea to wrap it in something plain.
My Boogie was sent to me from OcUk in the tube. Nothing more.
I'd use a bin bag.