I have noticed that there are 1st class outboundary Travelcard fares priced from various stations (such as Iver) where there is no first class service into London. These are probably throw backs to when 1st was available, but got me wondering. Would a 1st outboundary allow unlimited travel in 1st within the zones (on Thameslink, Southern and any others within the zones with 1st)? The first provision on these services is hardly worth the cost anyway, so more hypothetical than anything.