5.6.1808 dine at Knowles's, w. Fuseli, Jeffery / 7.8.1808 dine at Jeffery's, Eltham, w. Bonnycastle & Knowles / 7.5.1811 Jeffery, & British Institution w. M J & T T / 5.1.1817 call on Jeffery (among 8 incl. Knowles) / 9.2.1817 call on Jeffery, adv. Brougham / 7.3.1831 call on Jeffery (not seen)
I think these could all have been Francis Jeffrey DNB 1773-1850 who has a person record on GD website but only mentions of him in Edinburgh are coded to him. The 1817 adv. Brougham is especially likely to have been him. To edit the Edinburgh Review meant he was probably often in London and he could have rented a villa at Eltham. A bit hard to confirm at present under pandemic lockdown conditions