E mailed my local Nursery,(well and well known national compnay) as i saw them in there when dropping my little on off, here is the reply
Dear Mr Crow
Thank you for your recent email raising concerns about socket covers that has been forwarded for my attention.
Prior to your email I was aware that some concern had been raised about the use of socket covers, however as these have been recommended for use in settings for a number of years by the regulators and the fact that the Institution of Engineering and Technology admit there are no cases of any children being harmed by socket covers. We have not to date taken the decision to have them removed from our settings, however I am in the process of preparing a paper for consideration at the next Exec meeting in July.
We have a number of settings some with sockets located above dado height others with them at floor level and we must consider the potential of harm. At the moment I would consider appliances left plugged in to be of a higher risk category than socket covers inserted correctly.
I will include in my paper your concerns.
If you have any further comments they would be welcome.