Little time, no money and no endurance? Traverses are the solution. Here are two: a crimpy one at the Fraser Noble building and a pumpy one at Dyke's cliff.
1) Fraser Noble traverse: Chalky spots mark a traverse on often tiny crimps. It is about F6b.
The building is located on the Old Aberdeen campus (building 14): http://www.abdn.ac.uk/central/vcampus/kings/index.shtml
2) Dyke's cliff traverse. The second traverse is at Dyke's cliff at Newtonhill. From the car park walk directly down on steep grass and approach the cliff from the right. It is an overhanging wall with big, now chalky holds all the way. A slimy puddle towards the end focusses the mind. About F6a. It is usually possible after rain.