ABZ-KOI,LIS-GLA-LHR-HEL-TLL and return
Still possible for £487 on a few dates in August (5 or 6 night trip)
If you are really brave you could nest it with a TLL-HEL-LHR-GLA-KOI,LIS-ABZ return - available for £492 on some August dates (5 nights)
880TPs for under £1K