For future information for activators who dont know the area. If you park at West Lees (to the east of Rubers Law - room for a few cars), there is a good path right up to the summit of Rubers Law. It takes you alongside the new deer fence but there are no access issues through the deer farm itself going this way. The last bit is fairly steep but the views across the Borders are worth it on a nice day.
The first part of the path is show on the 1:25000 scale maps but appears to dead end in the woodland. The footpath forks left near the end and goes up the fenceline.
You can also walk up from Denholm to the north west, on good paths via Woodend - this is a popular walking area.