Gosh.
So BC offers the Winn/Walkers a tenancy at a peppercorn rent, to the detriment of the farm business (orchards untended, cider not being produced, experienced farm-working tenants would have been a more sensible choice). In return, BC gets a snide description in the books, and the impression given in a TV segment that it is the Winn/Walkers who produce the cider. They tell BC that doctors have given Tim/Moth weeks to live, at a time when the third book later details another walk then clear scan, but they don't tell BC about the miraculous reversal. Then they move on from the farm unexpectedly when BC starts to question the discrepancies.
They certainly have a pattern of doing a flit when they sense the jig is up!
Wonder if BC, or perhaps his friend mentioned in the article, is the source of the original health-related tip off to the Observer?