the link mentions abt an inexpensive i/o card for experimenting..
i had another quick look at maplin's website, and it looks like they have discontinued their cheap interface cards - they still do one, but it's £99 - ridiculously expensive.
i think you'll probably have to do some googling, or perhaps have a go at making a suitable device yourself - i don't know how familiar you are with electronics or electonics construction techniques.
i've not been to india, but it's always seemed a very interesting country - the managing director at my last job was indian and he used to make fairly regular visits back to see family. perhaps some day i'll make a visit too.
good luck with an interesting project!