Its been a long time since ive had a bellhaven wee heavy, but in general homebrewer wee heavy recipes (especially older ones) tend not to be very accurate, and a mess.
Since no one else has gotten back to you, my wild guess would be 1.065-1.070, 94% pale malt, golden promise or marris otter, 4% english 120L, 2% roast barley 500L. Mash at 156, using chloride over sulfate to hit mash ph. Take the first gallon of runnings and boil it down while stirring, until its almost a syrup. Then add the the rest of the runnings. Do a long boil like 3+ hours, and top off with RO water as needed. Aim for around 20-25IBU. No aroma hops. Use the scottish yeast and ferment at 60.