Maybe this has been raised before but could there be something in the fact that crucial events seem to happen between 2006 and 2008?
2006:
Timoth's brother buys a French chateaux and, a 41 minute drive away, a dove cote.
Timoth starts to experience symptoms (we have to take his word for it - he first attended surgery in 2009 as stated in 2015 letter, which also says he's had symptoms for 9 or 10 years.)
2007:
RayMoth buy the house and land adjacent to the dove cot (T already with symptoms)
2008:
Timoth's brother and family relocates permanently to the chateau.
SalRay is caught embezzling £64,000 (possibly having begun doing so around 2004, assuming that's when she started the job and gives enough time to accrue such an amount unnoticed. Assumption being the company began in 2001 and there was a previous bookkeeper.)
SalRay has also taken out 4 credit cards in Timoth's name (remember, he has symptoms by now).
Salray and Timoth get a loan from Timoth's London relative to repay Hemmings.
I don't know what I'm trying to glean here or there is anything. Just seems very strange that Salray began stealing and getting into debt around the time Timoth started to have symptoms and when they'd recently bought a ruined house in France. I think I need to re-read the Times piece about France.