An Employee Bulletin dated 23 March, from Brian Woodhead (the senior director for LU stations, he of 74% pay rise fame...) gives some "advice on social distancing in our stations."
This advice includes: "Avoid signing into the POM [Passenger Operated Machine, i.e., ticket machine] yourself."
Since the start of the crisis, unions have demanded POMs be switched off. Having either staff or passengers using a touch screen risks spreading the virus. There is no good reason for the POMs to remain on. If senior management is now telling station staff we should "avoid" touching them anyway, why not just switch them off?
If LU won't act, frontline staff on stations will need to take action ourselves.