It would be doubtful that you would get a 100% mortgage for the whole purchase price. 100% is difficult (even with a fairly good credit rating) in today's climate.

You might be able to get a 95% mortgage with the deposit (the other 5%) being "Gifted" to you by a family member or friend. This is often referred to as a gifted deposit.

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Another option may be a Homebuy Scheme, it is more or less a low-interest loan given to you as a deposit. You can read more about it here: www.home2own.org.uk you do however need to qualify for it and several areas have run out of funding.