NO, the answer to your question is certainly not
[why did you think it would ?]
and classed by whom ?
Where by the way is your gran gonna live ? YOu have written a house of my nan, so it is possible that it will be one of the other houses she has.
bUT if she continues to live in it, EVEN if she pays a market rent for being allowed to live in it, there is a clear reservation of benefit on the facts given - specifically that she has knocked off £30 000.
The tax position of under the market price sale of a house to a relative is such that you need to (pay for) tax advice to avoid Her being taxed n the transfer and you being taxed as well.