The official page saved and dated, the household's own facts and objectives in writing, and a dated file of every communication from any third party.
A dated file turns a decision into something reviewable
Three files are worth keeping. The first holds the government material as it stood on the date it was read, saved rather than summarised. The second holds the household's own facts: each adult's citizenship, current employment and any business interests, the assets available and their sources, each child's age, and what the family is actually trying to achieve.
The third holds correspondence, particularly anything from an intermediary offering a reservation, a deposit arrangement or expedited handling, recorded with the date, the name and what was claimed. None of this is legal analysis, but together it lets a professional assess the position quickly, and it protects the household from the specific failure of acting on terms that have since changed. It also makes it obvious when a claim made in a sales conversation does not appear on the official page at all.