I just had a look at the Cambridge 2018 stats for conditional offers v acceptances for Humanities and Social Science courses as I think these courses might be most affected.
The first number is the conditional offers made. The second is acceptances.
HSPS - 213 / 167
History - 214 / 176
Archaeology - 33 / 18
Law - 269 / 202
Architecture - 58 / 35
and so on ....
Cambridge do seem to offer by well over 20% for many courses.
Some of the gap may be students who chose to go elsewhere, but not probably not many in the case of Cambridge.
Even if there are only 10% less places on courses for the following year, this is still a significant reduction.
I think it’s great that Cambridge have committed to giving their offer holders this “second chance” as it were, but I do hope they are able to provide equal reassurance to the following year’s applicants.