If it's not one thing, it's another! This from the local police Faceache page - my bold
"Wiltshire Police
As part of the ongoing operation into the Amesbury poisoning, specialist teams will now undertake precautionary testing of the Wiltshire Air Ambulance station, emergency vehicles and kit worn by responders involved in the initial response to Charlie Rowley and Dawn Sturgess.The highly precautionary process, is designed to ensure that no onward contamination has taken place. The risk of this is assessed as low, however it is essential that no chances are taken and this is why the work is taking place.To ensure that the specialist sampling teams are able to complete their work unimpeded,
the Air Ambulance base, located in Semington, will close temporarily from 5pm today (Weds 1 August 2018). During the course of the work, the Air Ambulance will also be subject of precautionary sampling
and will be unable to fly. During the period that the helicopter is unable to fly, the charity’s paramedics and doctors will remain fully operational providing critical care in Wiltshire by using Rapid Response Cars. The cars have the same specialist medical equipment that is on-board the helicopter.