I was a volunteer home visitor for my local Age UK for 10 years. It was a marvellous job for me as I cannot commit to a specific day or time each week. AUK, would email me to ask if I could take on a client and sent me the papers if I could, I then contacted the client and arranged a mutually convenient day to visit. It was wonderfully varied work, I got benefits sorted out for 100s of older people leaving them better off and met lots of nice people. We had quarterly team meetings to keep us up to date and meet others in the team. Unfortunately, after 10 years funding ran out and the scheme ended.
Since then I have tried a number of other volunteer jobs, but they all want me to commit to a regular day a week, which I really cannot do. I did find another charity running a similar scheme, I will not name and shame. They had an immensely complex and arcane computer system that I could not get to run properly on my pc, the local organisers commiserated with me for the problem, but did nothing to help me sort it out and their HQ was no better. I struggled to deal with clients because everything had to be done elctronically, nothing else was acceptable and I often couldn't access the system for weeks on end. After a year I gave up and resigned and I have been looking, but have not found anything suitable since.