Robz364

I really dont see the point as switches cost almost nothing.
 
But - does it work when you connect the ethernet cable you have in your shed directly to a computer and which IP do you get then?
There might be a few different issues causing your trouble.
 
How did you connect your huawei router to your internet router in your house?
I would guess that it is set up as a DSL gateway router and there might be an option in the interface or CLI to enable the blue port on the back as a WAN port, which you could in theory connect to your internet router in your house.

Nothing impressive.