That is if you mean Furnace Lakes, Slinfold, W. Sussex.
I have fished the Plantation lake once with a mate and we had a few nice fish. My mate fished it again the other day and had a PB 32lb Common, but that was the only fish in a 72 hour session. It is not an easy lake by any means, so you need to work for your fish. I can't give you any tips because like I said I have only been there once. As for the other lakes on the complex, Roman Lake, Kiln Lake, and Specimen Lake, they all contain some cracking fish so you are spoilt for choice. Good luck on your session.