Re: Used to work there!
"... the savings from not having the expensive boffins miss half an hour a day in favour of a much cheaper tea lady(/man) could be considerable."
From a beancounter's point of view that's probably correct. However, from a general management point of view, your boffins might be more productive if they regularly get away from their desks, and perhaps have a chat with someone by the tea urn/fancy coffee production station.