I picked up the 2008 fare leaflet from Chancery Lane this evening. It
integrates the outer zone fares. Watford Junction or Zone W is not
mentioned anywhere. Railcard discounts can now be loaded onto Oyster,
except Network and Family. London Overground oyster fares are
seperately listed, but appear to be the same. LO Cash fares aren't
listed. Ealing to Greenford is mentioned as not intermediate stations,
so no new validators needed. There are new zone 2 and 2-3 caps, which
appear to be removing ambiguity.