Above, the hole; below, the console on Monday, before the work began:
The work is being carried out by Henry Willis and Sons Ltd, the famous Liverpudlian organ builder. They'll have further information on their website, at http://www.willis-organs.com/. The picture below shows the area where the console was, and the hole left by the removal of the old bellows from the casing behind.
Although at the moment it looks like a scene of destruction, it's wonderful to see so much hard fundraising work beginning to pay off. There's still some money to raise and a few months to raise it. For now, though, there is a sense of achievement: we are cheering the fact that the organ has, temporarily, fallen silent.