The website American Radio History is building an online archive for Record Mirror, the weekly UK music paper that ran from 1954 to 1991. It started the 2nd UK singles chart in 1955 after NME began theirs in 1952. Though they ceased running their own chart in 1962, instead starting carrying the Record Retailer chart. Living music history awaits every reader !!
Up so far are 70 issues of the 60s, 35 issues of the early 70s, all issues of 1974-1978 and 1980:https://www.americanradiohistory.com/Record_Mirror.htm
Also be sure to hover over the menu button Music Magazines to the Music Industry button to see 21 other UK and US music mags begin procured and archived, including all the big UK and US chart mags/papers.
If anyone has any missing issues of any of the mags/papers listed, I'm sure they'd like to hear from you. I contacted them once before, they will work with you, either accepting your scans, or paying for shipping and return postage for you to send your mags over for them to scan and return.
Groovy keen fab gear...