Anything is possible. It's potentially possible that the Hemmings family, their solicitor, their bank manager, the local police station, more than one local village business, the Walkers' village neighbour, Bill Coles, Bill Coles' friend, the Walker's relative's widow in London...have all engaged in a formless conspiracy since 2008, just biding their time to speak to the press and make serious allegations about the writer of TSP and her husband. And it's also possible that the Observer, Mail, Times, Telegraph, BBC, Spectator and other media outlets just credulously publish one person's version of events without research, fact-checking or attempting to speak to the "other side."
On the other hand, Occam's Razor.
It's certainly unfortunate that the Consultant letter confirming a diagnosis of CBD was issued in Summer 2013 seems to have gone missing. Apropos of nothing, describing a Consultant as having "smug, tight lips" (TSP, p.15) is rather odd, imo.
Incidentally, when a Hospital Consultant (of any discipline) delivers a diagnosis of a serious, chronic condition, they don't then just chuck the patient out of the office with a cheery "Sucks, eh, let me know how you get on." Next steps and treatment plan are discussed, further appointments (with Clinical staff, physio, speech therapy etc) are scheduled, information booklets are handed over, other sources of advice and assistance signposted. If one were on the brink of becoming homeless, this would be mentioned, surely, because it impacts ongoing care.
Ah well. People will believe what they want to believe. And the threads have been very entertaining.