Professor Ansted includes the Whinchat in his list, and marks it as occurring in Guernsey and Sark.
"Birds of Guernsey (1879)" by Cecil Smith
The Blackcap is notoriously pugnacious, but not more so than the Marsh-Warbler or the Whinchat.
"Territory in Bird Life" by H. Eliot Howard
So I believe would the whinchat, but I have no practical knowledge of either as pets.
"Aileen Aroon, A Memoir" by Gordon Stables
There were stonechats and whinchats then as now.
"The Vanity Girl" by Compton Mackenzie
MR. SWEET'S ACCOUNT OF THE WHINCHAT.
"The Natural History of Cage Birds" by J. M. Bechstein
We always have a fair number of whinchats in the meadows, and hardly a year passes without seeing them on the grass in the garden itself.
"In a Cheshire Garden" by Geoffrey Egerton-Warburton