Something odd going on with liquids at British airports per this post
I think it’s just because the machines were flagging bottles of innocent products as potential explosives rather than this being in response to any particular threat.
most (and all major) airports have not yet changed to the 2 litre machines, only 6 so far, and particularly at Birmingham they were getting lots of false positives which played merry hell with the functioning of the airport and queuing for security. When the alarm went off it had to be assumed that the machine was correct in identifying dangerous material and strong responses were needed.
Nobody liked that so they have been reverted until the government can work it out.
For all intents and purposes just rewind a couple of weeks and that is the current state of play.
Panic over.