A couple questions for Brits

[Linda C. McCabe]

Hello,
I'm writing a fan fic, (like so many others) and wanted to verify that a few
things we do here in the states is also done across the pond.

1) Do British children go from house to house Trick-or-Treating for candy on
Halloween?

2) At sporting events there's a few songs by the British rock group Queen
that have become commonplace anthems.  Such as "We Will Rock You" and "We
are the Champions."  Knowing that football (soccer) matches in England can
get a bit rough and rowdy - I'm assuming that those songs might also be sung
and have the stadium stomp with "We Will Rock You" done by fans.  Is this
true?  I'd like to introduce a little Muggle subversive sport spirit to
Quidditch, but want to make sure that the Brits also make use of those
songs.

3) Do Brits play basketball, ice hockey and/or street hockey?

Just wondering.

Thanks in advance,

Athena