I've been wondering about this for a long time, and asked a lawyer friend of mine to look into it for me:
As far as covert recording of shows goes, as far as I know this is not
a criminal offence - the police would therefore be reluctant to get
involved unless there was a serious breach of the peace, as they would
consider this to be a purely civil matter..
Apart from being ejected from the premises, I don't believe there is
any power for venues to seize recording equipment as technically this
would constitute theft on their part ie. an intention to permanently
deprive you of your property. Although they would probably request you
to erase the recorded material in front of them, in order to convince
them not to take legal action against you in the civil courts..
Provided you do this, then no further action should be taken against
you. Then again, you record shows so surreptitiously I can't imagine
you ever getting caught in the first place..
I know theres no articles specified, but this is as good as I've got so far!