This is a Joint Venture where, effectively, 75%(??) of the current easyJet self-handling operation at LTN is being transferred to Menzies Aviation Group.
The Joint Venture is very similar to the "easyTech" engineering arrangement which exists at a number of eJ airports. easyTech is 25%('ish) owned by eJ, and 75%(ish) by FLS, and fully managed by FLS. It has the advantage that it gives eJ a fully dedicated engineering set-up, but with the management outsourced to an established engineering company.
Menzies already handle eJ in AMS and PRG.