Full PRR when selling old house shortly after buying new (my existing house, my wife's future)

I live with my wife in a house that is in my sole name, though it is also her main residence. I have progressed MND and need to move as the existing house is dangerous for me now. My (our) house is on the market but the market is very slow. However, we have found the perfect next home. As I am dying, I want to put the new home solely in my wife's name, to save on issues when I die (my life expectancy is 12 to 48 months). As it happens, under Stamp Duty rules she would be a first time buyer, but our motivations are to move to a safer home. I am leaving my entire estate to my wife, value just under £1 million in total, so no CGT I believe. So, my (our present main residence) home A, her (our next main residence) home B. I am lucky enough to be able to buy her home B with my savings plus a £50,000 bridging loan before I sell my home A. We will immediately move to her home B while I sell my home A, 100%, and hopefully soon. I see from other posts there is a "grace period" (for lack of a better term) before HMRC is entitled to CGT on my home A. Is it 9 months or 2 years? Or am I wrong?

RSVP Also, will HMRC accept an exemption to any CGT being due if I excede the time limit under the Equality Act 2010 if I have hospital / doctor letters saying I had to move due to my illness?

Hi,
When calculating Private Residence Relief, there is a period of 9 months that can be added to the number of months the property was your main residence. You can see guidance here:
https://www.gov.uk/government/publications/private-residence-relief-hs283-self-assessment-helpsheet/hs283-private-residence-relief-2024
Thank you.