It will help if I explain how claims in negligence arise.
There needs to be
1. a duty of care
2. the duty of care needs to be breached
3. as a result of the breach there needs to be loss or injury
4. the loss or injury must be as a result of the breach
5. the loss or injury resulting from the breach must be reasonably foreseeable.
In order for there to be a claim in negligence, all 5 heads have to be satisfied.
And sorry to say that the blood pressure/stress is not a reasonably foreseeable consequence of his actions and in any event it would need to be a recognised psychiatric illness, diagnosed by a psychiatrist or other mental health professional, such as PTSD.
You can charge your time at 19 pounds per hour and it’s always a good idea to put together a schedule of that and provided to the other side and the court, in advance of the hearing. It is a Costs Estimate. Better not pull it out of the hat on the day of the trial but forewarn them that you will be producing it.
It’s not a judicial notice. It’s an application for costs.