Currently Being ModeratedFeb 14, 2013 7:36 AM (in response to mende1)
So it's completely fixed!
For anyone else's benefit who may ever have this problem:
They first replaced the back panel of the screen (this is a huge job) and unfortunately that didn't fix the problem. So the only other thing it could be is the screen cable, which they then replaced, and that fixed it.
Althought I had to get a new glass screen because it cracked when they were removing it to change the LCD panel.
Overall cost €200 including labour in a repair shop near me. It's now good as new!
Official Apple Store in Barcelona had quoted me between €450-500 euro to repair it.