The local electrical wholesaler does 50M cut lengths of CAT6 for next to no thing. The idea of running two is good.
All the CAT6 modules, weather resistant boxes, conduit, etc, etc cost next to nothing, but add them together and it?ll have to wait till after pay day!
I have made a start by swapping the one in one out 16A Commandos for a pair of Commando socket outlets (the High Tuff will enter fixed rather than via a commando input.)
So I will have 2 outlets down there For when my daughter wants heat / light in her shed (she has declined having a permanent connection).