unknown gery plug - behind stereo

[wildcat_lgf]

So I've searched through the forum - and despite a lot of other unknown plugs, I can't find any info on this one.
Previous owner had an aftermarket stereo (which he removed) so now I'm going to connect a factory Clio radio - and I have the following plugs:

3 black plugs which connect to the standard radio
1 white aerial plug
A home-made connection for his aftermarket stereo - to get power I presume? I'm hoping to ignore that plug (on the rhs of the photo)
But what is the grey plug for on the lhs?
I don't know if its something to do with the display (I haven't had that working yet because I don't have the radio sorted)?

 

[fairm010]

Probably the steering wheel controls?

 

[BoatNonce]

Quite possibly the display/stalk control connector, it's yellow on my Ph.1 though.

 

[wildcat_lgf]

Probably the steering wheel controls?

But it doesn't plug into the radio anywhere?
There is only 4 sockets on the radio (which fit the 3 black ones, and 1 white aerial plug). Nothing on the radio fits that grey plug

 

[wildcat_lgf]

Quite possibly the display/stalk control connector, it's yellow on my Ph.1 though.

If it doesn't connect to the radio - where would it plug in? This may sound like a stupid answer - but its not long enough to get near the steering wheel, and comes from the left, from the glovebox direction...

 

[BoatNonce]

Should plug into the back of the stereo.

Could also be the CD Changer connector too at a guess.

If you plug everything else in and turn the stereo on, does the information show up on the top dash screen?

 

[fairm010]

Perhaps it is the plug for the keyless entry Start / Stop button that you dont have, which is located to the left of your hazard button.

 

[skinz]

my bets would be for sat nav option

 

[wildcat_lgf]

thanks everyone for your advice...I'll ignore that plug for now as it seems to be suggested its an optional extra.
I can't seem to get the radio working though - whcih is odd. I can get power (the CD slot ejects), but no sound/stations/display...

 

[skinz]

Looks like u got a mk3 onwards from pics - u will need an ignition feed to aftermarket stereo - spur fuse or tap off cig lighter (if its ignition fed)