Golly
Even most closed meetings will make an exception for a newcomer - there should be a name and phone number for the meeting on the website, phone up and check if you want to be certain. Or just tell your husband to keep quiet!
There are people who are anti AA and people who are pro AA and all have their right to an opinion - but I am always suspicious of people who knock something without saying why and without providing a better idea. Also worth saying that most of these sites refer to America, where (sad but true) AA can be a lot more doctrinaire. In Britain, people tend to be a lot more accepting of difference and of doing whatever works.
There's someone else on here from Bristol - perhaps you could find her and see if she can tell you more about Bristol meetings (I've only ever been to two meetings in Bristol). But they'll basically be the same as everywhere else. The ones I went to were very friendly and had a very "healthy" feel about them.
Questions - you will not have to say anything, though you may be invited to introduce yourself. In any case, if you feel at all uncomfortable, "pass" is a perfectly valid response to whatever they throw at you. Nothing is obligatory. Again, phone the number of the meeting to set your mind at rest, but I am sure you will be fine.
There is no charge for meetings. We are self supporting through our own contributions ("tradition 7"), which means we have a voluntary whip round to pay for rent, teas, coffees and the telephone office. typically, newcomers (and especially guests, like your husband) would be expected NOT to put into this (because then we wouldn't be self-supporting.) If you do put in, it is up to you how much, though most people who can afford it probably put in a pound or two. I personally put in about £2.50 because this is the price of my first drink; but when I'm broke it's sometimes just the shrapnel in my pocket! No one watches, and no one checks.
Typically, there will either be a round table at which the keenies like me sit, and rows of seats around the edge of the room; or rows going back, facing the "top table" where the speaker will sit. You can sit where you like; again, the eralier you arrive, the more choice of seat you will have. In general, the secretary starts the meeting; the speaker (an ordinary member of AA who's 6 months or more sober, i.e. just another ex-drunk) will tell his or her story for about half an hour; and then it will be opened for raised voice sharing, which means if you want to say anything, wait for a gap, intorduce yourself and start speaking and if not, stay quiet.
The smallest meeting I have ever attended had 5 people including me (Birchington Saturday); the biggest meeting (Pont street in Chelsea) had well over a hundred. I would say a typical meeting has between 10 and 30 people in it. Again, asking someone local will help more than I can here. As you go to a few, you will find the meetings you like and the ones you don't. I personally prefer the smaller meetings, but each to their own.