Have tried to replace double light switch (for separate hall and outside light - both singly operated). There are red, yellow and blue wires and a small piece of red which fell out when opening switch. Put red to L with small piece looping to other L and yellow and blue to separate L1's but this affects the light in the study (it flickers/stays on) Didn't take proper note of where the wires went before as assumed this was straightforward. Any advice gratefully received.