Renault Laguna 2.0 dci 1999 (T reg) - Central locking dead - fatal

I desperately need help...I have a laguna 1999, 2.0 dci estate, I've had it for
> about 8 years and its been a great car. It came with only one key and
> that's now had it. I have to unlock the drivers door with the key, get in
> and close the door and then unlock the other doors and boot using the lock
> button in the centre consul. Same in reverse to lock. Can you suggest
> how to overcome without having to remortgage and take to renault. Is
> there any way that I can get keys and some electrical gummings from an
> other car and refit in mine or repair the original key and get a duplicate...
>
> Any suggestions so that I can keep the car as its brill, ultra reliable
> and returns 55 mpg even with 125k on clock.