Flintstone, in answer to your question marks, I would presume a 'screen failure' refers to the EFIS screens fitteed to the A109E.
There are however old fashioned 'steam driven' standby instruments to cover for this very failure (which is not unknown, I had one myself). The standby's are small but clear and present no problem to use IMC or at Night (again personal experience). Let's what and see what AAIB say.