Dimmer Dilema

[talula]

I have tried to wire a one way dimmer as the old switch was wired and the light came on but would not dim. The original switch was wired as follows; 2 brown wires into L1, one brown wire into L2 and an earth into the back of the casing, there are also 3 blue wires coming out of the wall which all go into a block cable connector with nothing coming out of the other side.
The dimmer has the following connectors; L1, L2, a wavy line with an arrow going through it and an earth.
Any suggestions on how I can get it to work?

[comms]

Try putting the two browns into the terminal with the arrow/wavey line.
The single brown into L1.
Leave blues in the connector block.
Connect the earths to the earth terminal.

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prior planning & preparation prevents p*** poor performance.

[talula]

Works perfectly. Thank you very much.