I changed an old fuse board for a new consumer unit and the lighting for this house was connected in two separate fuses. So I swapped one for one and put them into two 6 amp breakers. Now the light at the bottom of the stairs is permanently on and the light at the top is off. Light at top controlled by two way switching. Light at the bottom just controlled by single switch! I think it is possibly one big ring as I am getting cutlrrent on the other when only one is connecting into a breaker?