It's a small department in a larger public sector organisation. Employs people with specific expertise on some very high salaries and runs almost like a small business in its own right. I have a fairly senior post which is the "bridge" between the experts and the support team.
Before I started the CEO told me how wonderful this man was and how she'd relied so heavily on him, trusted him 100%, how the organisation would struggle to operate without him/the role. This didn't phase me, I'm good too 
My team also think he's wonderful.
However, what I am discovering is that he was just left to do his own thing, no one really knows what that was, that it actually wasn't very much and the bits he did do no one understands. The support team love him because nothing much has been asked of them. The CEO loves him because she didn't have to worry about the things he covered, but she doesn't seem to realise that's not actually very much.
I'm a month in. Maybe I've got a shock coming and some of the work is cyclical, but for my £70k salary, I reckon I've done about 4 days of real work in the last month and this is a period where I'm finding my feet and would expect to be slower than usual.
I really don't now what to do. I don't want to stitch myself up by pointing out that the team is too big for what's needed and I'm not sure I yet have the credibility to explain that everything they believe about former staff member is wrong, but this is ridiculous. Also I'm on probation.