Kenwood: expenses, May 1968.

The imminent Bonhams auction of entertainment memorabilia has a few Kenwood related goodies. It's possible that the vendor is none other than our old friend Pete Shotton, as the items include the scribbled lyric for I'm Only Sleeping as featured in his book, together with a table that, it is claimed, sat in Kenwood, and around which John and Yoko muttered at each other on the Two Virgins night (the only other person there being Mr Shotton), plus, most interestingly, the above; a detailed breakdown of John's household expenses for the month of May, 1968. At that time, John's live in "P.A." was none other than...you know who. Whatever, whether or not these items do come from Pete, the sheet provides another (in this case literally) valuable insight into life at Kenwood.
Given that you can multiply these figures by around 13 to gain a rough modern equivalent, it's clear that John ran a fairly profligate household - in modern terms, the expenses come to around 31,600 pounds! The garden alone was costing just over 1,000 a month (assuming this was a typical month), presumably most of which went on the gardener's wages: so he was probably on around 250 per week. The combined upkeep of Mimi, Cynthia's mother and the ignoble Alf was costing John around 4,600 per month. (Lil got a third of what Mimi and Alf got - with Alf getting most of all. One assumes this fact was not conveyed to Mimi.) John himself made do with around 3,250 in cash for "expenses" (and Lord only knows what they were).
(Also note around 1,600 for Cyn and her mother to go to Rimini on the Adriatic. Again, this may prove useful in attempting to pin down the Two Virgins chronology, something which thus far hasn't been done to anyone's satisfaction.)