I wouldn’t bother with Great Hill just yet as it’s an utter bog. Especially heading down the Roddlesworth side. They are putting the slabs all the way across though which should make it rideable year round.
I would do San Marino to Witton Weavers, up to the tower via Lyons Den, mess about around the tower if you want and then down Stepback Brook to the Royal, into Roddlesworth woods and over up to Great Hill, this way you get the White Coppice descent in too, minus the bog. From the Coppice follow the Goyt to the reservoir and you’re more or less at the Nab.
I think, Simmy, you’re referring to the climb from Sunnyhurst woods, which heads near a UU place.