Oil Leak in 2010 Dci Grand Scenic!?

Help with unsolveable oil leak on Renault Grand Scenic. Leak on drive shortly after purchasing privately. Took to Formula One in late June who made some adjustments, didn't work, then took back and they diagnosed oil level sensor, part only available from Renault, took to them, who diagnosed Oil Pressure switch. They replaced didn't work, then took pack, they diagnosed Oil level sensor, no parts in UK, on waiting list......Three months later....

Part finally arrives from Limoges! Replaced by Renault but after a day, still leaking took back, engineer says oil still all over engine, they'll have to strip and check turbo, main engine seal, and back manifold... £2500 plus please?

Now officially tearing my hair out. It's only a five year old car...yes with 95000 on the clock but wtf! What should I do. Has anyone ever had a non sensor related oil leak on one of these new shape Scenic diesels before?? Anyone recommend any experts in oil leaks in Essex area?

Oil Leak in 2010 Dci Grand Scenic!?