I've never disinfected my shopping. When DH brings it in I unpack it and put it away.
The postman doesn't wear gloves when he delivers the mail, so I've never worried about it.
After handling the shopping or mail, I wash my hands.
Most of the spread of the virus is through droplet and aerosol transmission, so being careful and washing your hands after handling goods should be sufficient I think.
People eating and drinking on the go
To think that London, or anywhere else for that matter, does not belong to any one demographic