http://newsvote.bbc.co.uk/mpapps/pagetools/print/news.bbc.co.uk/2/hi/technology/7684322.stm

Broadband users reach their limit

One million UK consumers have exceeded or come close to exceeding their broadband usage limit, research from consumer group uSwitch has found.

So-called usage caps, where internet service providers limit the amount of bandwidth users can have in any given month, are standard practice......

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http://themediaguru.blogspot.com/2008/05/orange-fair-usage-policy-update.html 

http://www.geekscribes.net/blog/2008/05/23/orange-faq-updated-more-details-on-fup/

http://www.geekscribes.net/blog/2009/02/27/orange-mauritus-adsl-myt-prices-fall/

http://www.orange.mu/internet/faqs.php

1.8 what are the available speed for surfing?

ADSL is available at 256kbps, 512kbps, 1 Mbps, 2 Mbps.

1.13 can my family and I surf simultaneously on more than one PC/laptop?

Yes, you can have internet access simultaneously on more than 1 PC and laptop.
However, your surf experience ie. speed on each PC will depend on the ADSL package you have subscribed to.