Came across the website when I was looking at Twitter today
I started my OPS last year, looking at the Upper Whiteadder valley which lies in East Lothian and covers the upland parts of 4 parishes - Innerwick, Spott, Stenton and Whittinghame. There are only a handful of upland farms there but there are older settlements which have been abandoned.
So far I have used census info, the OPR's and the valuation rolls. The National Library of Scotland have a fantastic range of historical maps online which have been really useful and I need to spend some time in the National Archives to see what I can find there. The staff at the local history room in Haddington library have been really helpful and I am looking forward to the opening of their new local history centre next year.
Even if you think you know everything about a place, it's amazing what else you can learn