Lower ligature risk USB charging cables. These would be used by mental health hospitals to allow (risk assessed) patient to charge their devices without introducing ligature risk.

To go along with this:

Bulk USB charger. Imagine a 20 port USB hub, but this has no USB connectivity. It only has USB power. It would be kept in a secure place in a mental health ward and would allow them to charge patient's devices. This would mean that patients get electronic devices but without having access to cords (ligature risk) or mains plugs (self harm risk).

(Take a UK 3 pin plug. Place it on floor with prongs up. Jump off bed onto plug with weight on one foot. That's an unpleasant injury. Removing that risk is useful).

Advantages:

You don't need to PAT test each charger coming into the hospital. You reduce (slightly) fire risk from bad quality chargers.

You reduce ligature and self harm risk.

You allow patients access to electronic devices which has some "safeguarding of liberties" benefits.

Disadvantages: selling to the NHS is possibly hell, and selling electrical equipment to the NHS is possibly even harder.

You're creating a vigh value stash of easy to steal equipment. MH hospitals already have lots of IT and stealable medication so they should be able to keep it safe but maybe a ventilated safe would be part of the package.