John's probate record lists his address as Hill View so I think this is certainly the location of the Tea Gardens. I think John and Emily were involved in the running of Tea Garden once John retired in 1926.
There is a report on their Golden Wedding Anniversary on p13, Western Daily Press, Saturday, November 12, 1927:
“Golden Wedding. On November 8, 1877, Mr and Mrs John Gallop were married at the Parish Church of St. Michael's, Dundry, by the late Rev. Charles W. Boutflower (vicar). On Tuesday last they celebrated their golden wedding. Mr and Mrs John Gallop are highly respected in the parish and a large number of relatives and friends partook of tea, at their home, The Tea Gardens, Dundry, the handsome wedding cake being the gift of the children. Mr John Gallop who has reached the age of 75, and his wife, 72, are both in excellent health. Mr J. Gallop, who was born in Dundry, was formerly employed the Long Ashton District Council as a roadman for 40 years, only retiring from active service a year ago. He is a lover of the garden and is still able to do most of his garden duties. Five children survive, two sons and three daughters. One son, Herbert John, enlisted in the 1st Life Guards and has seen 12 years' service. During the war he was on Active Service the whole period 1914—1917, and fortunately returned to England unharmed in any way. Another son, William is an inspector for the Bath Tramway Co. The happy couple, who have lived in Dundry all their lives were the recipients of a large number presents.”
It was advertised as Gallop’s Tea Gardens in July 1926, p1, Western Daily Press, Friday July 30, 1926:
“GALLOP’S TEA GARDENS. Dundry (within easy reach of 'bus).-Teas, etc., supplied at moderate prices. Parties catered for.”
Harriet Harwood was running the Tea Gardens until her death in December 1922. p7, Western Daily Press, Saturday, December 23, 1922:
“Funeral of Mrs Harwood. The funeral of Mrs Harriet Harwood, widow of the late Mr George Harwood, Dundry, who predeceased her 22 years ago, took place amid many signs of sympathy on Tuesday in the parish churchyard of St. Michael’s, Dundry. Deceased, who had attained the age of 82, was well known and greatly esteemed by a wide circle, being the proprietress of the noted Dundry Tea Gardens and the chief village shop …”
So was running the Tea Gardens between 1923 and 1926? I imagine Harriet's probate delayed a business sale until mid-1926. I am having a look and get back to you here.
I hope this helps,