Thanks for starting the thread... very much feeling this at the moment. My folks are in Coventry in a retirement flat. Mum is 90 and in fair shape but dad is 100, no less, and has fibrosis, so a whiff of pneumonia will carry him off.
I was due to visit on March 10 but my brother nabbed that day (doing a good job by sorting them a new mobile). By about the 12th I began to realise that a visit from a Southwark dweller who had been on buses and in taxis in recent days was looking less and less wise almost by the hour. So... called it off. Luckily for me there's understanding and zero guilt-tripping from them, but mum is upset and I honestly dunno if/when I'll see the old man again.
Sadly attempts to get their Skype working again have proved problematic as mum can't use the simplest technology and dad has very little sight left.