On 2 Sep, 12:21, Paul Terry wrote:
In message
, Andy
writes

One possibility is parents who want to top up their kids' oysters
(although with fares so low for kids this might not be frequent!!)

Under 16s travel free (unless they've been naughty and had their
concession withdrawn).

Not on the underground they don't, only buses and trams. The
underground has a £1 fare.