Cashier -I'd like to say that one takes a picture of the Pope and stamps, spits or worse on it.
But in reality, it's no different than entering a RC church except there are no gymnastics on entering- such as crossing oneself or kneeling. And don't look around for idols, weeping or otherwise, nor confession boxes . Otherwise it's just the same.
There's no shaking of hands with germ carrying strangers, (i don't know if you RCs do this during your normal service but during the twenty de rigeur funerals that everyone attends annually down here I always seem to be shaking hands with some old woman sitting next to me, not always my wife) .
Finally,there's less communions, no bell tinkling, and more singing. Join !
Don't worry if you err . Many ex-Catholics do at first , mumbling in Latin, claiming the Virgin Mary is giving them some message, and whipping out their rosaries. But as a quarter of my local congregation are exRcs that's fine- occasional lapses into popery are forgive. Even our priest is an exRC -and a married woman.
The Anglican church is very broad and accepts many varieties of worship, behaviour, genders, sexual proclivities -and degrees of religious belief, such as mine which are none.
So, Cashier, go along and act in any way you like, except, well, don't be over friendly - the English influence means that a little reserve is well regarded in strangers. Excessive jolliness may mean one of those African clapping and dancing churches is more appropriate.
Please know that in London very few English people go to Anglican churches and, depending on where you live, you may end up with a Jamaican accent.
Why not go to your nearest CoI church tomorrow morning? Depending where you live you may see me there. I'll be the one looking like he's reading the Bible during the sermon ,whilst actually posting AAM on my blackberry.