Well, you could create the trust now, but there is no real point in so doing. You only want it to become effective on your death, so therefore it can be created in your will. The only possible other consideration is if you became so incapacitated that you were unable to manage your own affairs, so someone was granted Power of Attorney to manage them for you, that person might mischievously decide to try to sell the house and/or evict the OH. There is protection against that sort of abuse, but you might raise this with your solicitor now, to put your mind at rest..