On our return we heard with much surprise that Mr Buller had called while we were out. He left his address, & I am just returned from seeing him & his wife in their Lodgings, 7 Bath St. His Errand as you may suppose, is health. It had been often recommended to him to try Bath, but his coming now seems to have been chiefly in consequence of his sister Susan's wish that he would put himself under the care of Mr Bowen.-Having so very lately heard from Colyton & that account so tolerable, I was very much astonished-but Buller has been worse again since he wrote to me. -His Habit has always been billious, but I am afraid it must be too late for these waters to do him any good; for tho' he is altogether in a more comfortable state as to Spirits & appetite than when I saw him last, & seems equal to a good deal of quiet walking, his appearance is exactly, that of a confirmed Decline.-The Children are not come, so that poor Mrs Buller is away from all that can constitute enjoyment with her.-I shall be glad to be of any use to her, but she has that sort of quiet composedness of mind which always seems sufficient to itself. Letter 43

Richard Buller had been educated at Mr Austen's school at the rectory at Steventon. You will, I am sure, recall that he remained on very friendly terms with the family and JA mentions him very affectionately in her Letter 25

I had a most affectionate letter from Buller; I was afraid he would oppress me by his felicity & his love for his Wife, but this is not the case; he calls her simply Anna without any angelic embellishments, for which I respect & wish him happy—and throughout the whole of his letter indeed he seems more engrossed by his feelings towards our family, than towards her, which You know cannot give any one disgust.

He became the vicar of Colyton in Devon and lived there with his family in the large Tudor vicarage, show below:

it is thought the Austens visited him there in 1801 after they visited Sidmouth.

I thought you might like to see a bit more of this very lovely little town and so I am linking to its very informative web site.

Sadly all Richard's attempts at cures did not avail him much help and he died a little over a year later on the 19th December 1806.