Unfortunately I moved away from that area long ago (1987 to be precise) Weirwood wasn't open to us scruffy coarse fishing types back then.
Pipinford is on the main road from East Grinstead going towards the coast, look for the sign for Chelwood Vachery on the right and pull into the layby on the left (all information given liable to be out of date !) 6 or 7 lakes at the bottom of a valley try looking it up on the web !
Absolutely cracking place and the first place I ever shared with a red deer coming down for a drink, also squaddies with thunder flashes in the middle of the night lol.
If you find it and go down let me know what you think.
Cheers
Ian