Originally Posted by Frequentflyer99
In fact incorrect. A 7 day stopover in LON is allowed both on the outbound and inbound on the ex LIS fares at a cost of 75 Euros each stop.
I hope the rules have been changed, or perhaps the stopover must be purchased prior to flying the first leg. In 2003 I was not allowed to add a stopover to the return leg and ran into the problem of needing LHR-LIS inventory for the transatlantic date. I suppose Europe-based travelers would always buy a stopover at LHR for the return so this isn't really an issue (except for adding to the fare cost).