As the title suggest, my Ddad who is 73, and been isolating with my mum for 3 months due to fears over getting Coronavirus. He has anxiety issues, including health anxiety, and they have been refusing to see family (understandably) as they don't want to risk getting ill.
He has received a Jury service letter starting in a few weeks in a very large town, which he would only be able to get to via train as he would be too anxious to drive there (traffic/parking is terrible).
Is he able to refuse this? I have been googling away and can't seem to find anything that categorically says yes.. which seems ridiculous given that he has been isolating for so long as he is clinically vulnerable, yet is meant to take a train now into one of the busiest towns in the UK 
Any help/advice much appreciated!