Hello and welcome to the community,
Whether you need a deposit or not depends on the provider and your own financial situation - employment etc... The best option is to shop around and ask what each one provides. You can start by comparing some of the leading providers here: http://www.money.co.uk/mortgages/right-to-buy-mortgages.htm
Hope this helps,
You can use the discount as your deposit, feel free to contact me if you would like any further info or a quote.
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