LON-DEL F class with Lufthansa or Swiss £2483
Not a bargain by any means but may be of interest to some as you see J fares at this level with BA on this route.
Can use the Frankfurt first terminal and earns 300% miles with Miles and More (only on the FRA to DEL leg as LON to FRA leg is on J)
Availability is very good and open for most of this year and all of 2018