Hi Knightmare,
It sounds like you're asking about the 2 year main residence exemption. (Simplified) If you inherit a deceased persons main residence, you may have 2 years to dispose of the property without any capital gains tax consequences (depending on circumstances). It only applies to the deceased persons home, not rental properties, not shares, nor any other investments I'm aware of. Also, you may not need to obtain purchase documents or market value if the sale is exempt for CGT.
Your accountant should be able to guide you through this properly.