I've been meaning to get some of these extensions for some time and finally invested in this set from Machine Mart the other day:
https://www.machinemart.co.uk/p/pro171/
They have a kind of universal joint that allows about 10° of movement of the socket; really useful for accessing bolts in tight spots.
Having now had the opportunity to try them out, I can say they would be a handy addition to any toolbox. I can now get my torque wrench on the rear shock top bolt without removing the tank. Thoroughly recommended.