Transport Focus have published their report based on their survey of bus pass-holders (and those entitled to bus passes) and how the pandemic has affected their willingness to use buses - see -
https://www.transportfocus.org.uk/publication/getting-free-bus-pass-holders-back-on-board/It will be interesting to see whether this effect endured.
BTW▸ - this reminded me that I am now entitled to a pass myself, so I went to the Gov.
UK▸ website, which gave me a link to my local authority's website for information - but this was broken and didn't work.