Citroen C5 2.2 hdi (2001) SatNav ECU

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Please can anyone advise about replacing the SatNav ECU?
I have bought a second-hand replacement ECU unit but am not sure how to get the old one out.

I can see where it is, I think (to the right of the steering wheel above satnav disc unit) but cannot see how to get it out.

Any advice would be very much appreciated.

Edit: having taken a closer look = it's not where I thought - does anybody know where it is located?