Firstly, just a big thanks to everyone on this forum for making it so great - your advice has come in so handy to me on so many occasions in the past, but I'm really stuck on this one and hopefully someone will be able to offer advice.
Ok, so I did a pretty stupid thing with my V reg, Ph1 megane coupe - the battery had run down, so I tried jump starting it from a Ford Focus. Without realising, I connected the wrong terminals and the wires started to melt. Whipped them straight off, and started to check out what damage i'd done.
Now, the headlights work, the dash clock and instrument lights all work + the passenger elec window. But... I've lost my central locking, driver's side elec window, indicators, interior lights.
Checking out the advice on this forum, I understand that all these things have a connection with the fuse box next to the battery, so last weekend gained access to it and checked out the fuses. All seemed ok, slightly corroded, but I understand that's a common problem also. Decided to replace the fuses, and give the box a good clean. Plugged it back it, but nothing

Have I completely ruined the car? I'm reluctant to take it to a garage, because I'll be selling the car anyway (my main car is now the focus). Hoping that I don't have to spend lots of money, just to get it working to sell.
Any advice you guys could offer would be really really appreciated.
Cheers in advance.