Don't be fooled by the cranky exterior of the Exclusive Brethren. They're the religious equivalent of Vogons.
I know because I was brought up in them till the age of 9. For those who don't know me, no, this does not make me sad and repressed. (Aleister Crowley was brought up in the Exclusive Brethren also - it's why he was so vehemently anti-Christian and outrageously hedonistic).
The Exclusive Brethren prevent their members from watching TV, listening to the radio, using mobile phones and computers, using contraception, eating with non-believers (this includes other Christians), going to pubs, having pets, and talking to members of their family who have been thrown out for committing any of these offences. They make their women wear headscarves and don't allow them to cut their hair (you can spot them very easily, they're the exhausted-looking ones with the bovine expressions and umpteen kids in tow). And the Gods help you if you were discovered to be gay. Two women who lived together (dunno if they were lesbians or not) were excluded on suspicion of being lesbians. Pets were banned sometime in the mid-sixties; this resulted in a number of people gassing their budgies (this was still the time when gas ovens used coal gas).
As a result of the behaviour of this delightful organisation, I didn't see either of my sets of grandparents for the last 20 years of their lives (they were forbidden to talk to us); and my aunt's husband intercepted all my mum's letters to her mum (when her mum was dying) and didn't give them to her. I only found out that my other grandmother had died because someone who worked in the Register (of births, marriages, and deaths) told me.
They stick rigidly to everything it says in the Bible (you can find sources in the Bible for all the practices listed above). So if you ever hear me being anti-Christian in my remarks, the above will explain why. (I do realise that not all Christians are like this, but they're all referring to the same holy book. I have the deepest respect for many individual Christians, but I have a strong philosophical objection to the basic premises of their religion.)
There's a support site for people who have suffered from the Exclusive Brethren.