Hall and Porch Light switch replacement

[Smartyonline]

Hi - I'm probably being dumb but I'm struggling to replace a 2 gang switch that controls my hall and my front porch light. The hall light can also be switched on/off at the other end of the hall whereas the porch is just got the one switch.
Coming out of the wall is one black cable with a small brown sleeve on it and then 4 brown wires. The plastic switch I took off had two L1, L2 and L3 fittings whereas the one I am fitting has two L1, L2 and C fittings. The one I took off has a small bridge wire running from L1 to the other L1 (I think). I did the obvious DIY step and just tried to replicate what was already there but after around 2 hours and every possible combination I could think of I am stumped. Can anyone help please ?? Thank in advance.

 

[bernardgreen]

L1 on the new is not the same function as L1 on the new

Old Switch..... L1 ..... L2 ..... L3
New Switch.... C ..... L1 ..... L2

On the new switch the link will be between the C terminals

If the new switch has a metal front plate then it MUST be earthed

 

[Smartyonline]

Thank you Bernard, very much appreciated. The one black wire with the brown sleeve. Which terminal would that go to in the new switch, L1 L2 or C please ?