hi SimonG, it looks to me like you are approaching the point of diminished returns. 40 cms is a lot of insulation if the new recycled eco wool has a good insulation value. I haven't heard of it, can you tell us more?
It's important to have as even a level as you can and 30 -40 cms is a fairly high variation. Is some of it blown in? covering the joists and stopping direct leakage is something I'm working at in the house right now too.
I'm not sure what you mean by having a part of the loft that is boarded, is this a floor that was put down, as an attic space? Boards aren't all that good, if they are quite thick and fairly tight together they are better than nothing. If you have room you might consider lifting the boards and making another level of insulation in a raised floor, and still use it as attic space.
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