I'll answer myself then, in case anyone ever has the same question lest they find this dead-end.
I bought these so far (maybe a third I can't recall):
The Painted Garden - English Watercolours 1850-1914
Hobhouse, Penelope; Wood, Christopher
London: Pavilion/Michael Joseph, 1988
ISBN 1851451641
(a lot of fancy big ones in this book but also enough 'peoples' gardens' to make it worth the price)
Victorian Flower Gardens (Country series No 12)
Clayton-Payne, Andrew; Elliott, Brent
London: Weidenfeld & Nicolson, 1988
ISBN 0297794434
(more cottage & regular gardens in this one)
