Sean are you on the following group? Also what is the reg of yours as I may have in service pics of yours.
I know quite a few people including myself who have resolved your problem via the following process:(also listed on the group with photos, just use the search feature and it'll come up)
1 Remove window and frame can be as 1 unit mainly depends on how good the sealant is.
2 remove 1/4" plastic sheet from inside face of the said window.
3 then remove the rubber layer from the inside face of the window.
4 refit frame/glass with sickall (if I recall correctly)
Snatch/WMIK Land Rover Club
https://www.facebook.com/groups/snatchlandrover/
Tyler