Hi there, I was brought up in Ashkirk, and married in the church there 2 years ago, its a truely enchanting little village all year round.
Sinton Gardens you talk of, It is actually spelt SYNTON, and to my knowledge there are no longer gardens there, just farms and holiday cottages.
I am sorry I can't help you more.
Good luck. (Ps if you type Synton Mains into the popular search engine it shows the holiday cottages with contacts who may be of use to you).