I have not looked at Exeter's files, but did look at York's file for the time after she had been beached. That was impressive as they were looking at ways of salvaging her. A full set of large drawings (about 4 foot long) with many details. However, the files for the severe damaging (not "sinking") of Queen Elizabeth and Valiant are about 60-70 pages of text with only small diagrams.
IF you have a friend who visits best to get him to have a look.
Exeter's post-action report is very detailed.
At the TNA RO the info can be in one file, or scattered through several (sometimes not specifically mentioned in the document title).