Yes there have been a couple of cases which have affected placement orders. Re B-S is the big one, and you can read it here
This is my understanding of it, BUT the person you really need to explain it all is Spero (our resident family law barrister ie. expert). She could tell you about any other important recent cases, and how it's impacting and everything else as well! Hopefully she'll be along soon. And correct anything I've said if it isn't right (please!).
I think this sentence from the beginning of the judgement basically sums up what the Judges felt was wrong - "We have real concerns, shared by other judges, about the recurrent inadequacy of the analysis and reasoning put forward in support of the case for adoption, both in the materials put before the court by local authorities and guardians and also in too many judgments. This is nothing new. But it is time to call a halt."
Basically, the high court said it's fed up with courts being presented with poor reasoning, poor arguments, and Judges making poorly reasoned judgements etc. So it set out very clear guidelines for what is and isn't acceptable. The court (I think) also said that cases should be pushed back beyond the government 26 week time limit if the LA aren't presenting a good enough case for a PO (or other option).
IMHO, in many ways the ruling is a good thing, because poor paperwork, and shodddy reasoning could lead to wrong decisions being made
But it is affecting PO's and length of cases though. I know PO's are down on last year (I think 9%?)
I am hearing from approved adopters and adopters going through the process that they are being warned that there are less children available because of the reduction and they may wait longer to find a match, and (anecdotally) it does seem to be taking longer for some people. Although matching has always been a case of 'how long is a piece of string'
IMHO it's very difficult to find a balance. Poor paperwork and reasoning can lead to wrong decisions being made. It's not acceptable to sacrifice good practice for speed. But cases also need to be decided quick enough for the childrens sake, so they aren't waiting in care for several years.
Here are some links explaining the impact of the case -
www.lawsociety.org.uk/communities/family-section/articles/spotlight-re-bs
www.childprotectionresource.org.uk/when-can-the-court-agree-adoption-is-necessary/ The bit about Re B-S is near the bottom