Management hasn't sold a single share nor have they put out statements or tweets that create liabilities. To me they seem very deliberate given the billions which could be made for them and shareholders.
It would not surprise me at all if they are still waiting for developments. Obviously final sawston certification might be one item but also the final adoption of the announced regulatory changes. It makes sense that as they will be taking full advantage of the new regulatory changes that in the first instance these changes are fully implemented and official policy IMO.