In message , Nicola
Redwood writes

What do all you contractors / consultants do if you don't have season
tickets?

None of the central London companies I work for requires receipts for
journeys of less than around £12, unless by taxi. This has been the
pattern for as long as I can remember, probably because they know that
paper tickets are either swallowed by machines or travel cards need to
be kept for onward/return journeys.

I just write something like "One day travelcard, £5.20" or whatever on
the claim form or invoice - it is never questioned.
--
Paul Terry