Secure Document Storage?
Your Will should be kept in a safe place and you should definitely let your executors and or your main beneficiaries know where it is kept.
If you hide your Will too well and nobody can find it this causes many problems and it may be declared that you have died intestate!.
Should I use my Bank?
Be wary of your Bank offering a free Will!
NOTHING is free with any bank! because the banks terms of business are normally to act as executors on the so called 'free Will' and they charge at least 3.5% + other charges of the dead persons estate for their time!