They're all resin. Kood is cheap and decent quality, or SRB.
SRB Griturn ND grad filters are actually Hi-Tech filters, my soft ND0.6 from them works great and showed no visible colour cast after I shot slide film with it.
Almost true - SRB filters are made by Formatt, but are not the same as their Hitech range.
Strange, my one has a 'Hitech 85 filter system' logo on the back of the plstic case and the barcode on it is marked 'Hitech 85mm ND0.6 Grad Soft'. If you look on the Formatt site at the standard Hitech filter range then their exactly the same as the ones from SRB. I wonder if I accidentally got send the wrong one or something...
It's well known that some of these grads vary a bit batch to batch though. Lee is the only brand that you can really guarantee as consistent in colour, density, and the strength of the grad cut.

I bought the Cokin last week from Jessops £21
without
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with
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well to my eyes
the colours in the mid-ground are poor with filter in-use..?
and the grasses are not sharp
would a polariser have been a better choice maybe..?
Not sure your comments about the foreground and sharpness are valid, ....................