I did a search here for Optik paper, but didn't pick up anything.
So...
Has anyone heard of Oxford's paper they call "Optik"? I find a lot of Oxford paper very poor for FP use, but their Optik brand seems to be just as good as the equivalent Clairefontaine, and half the expense.
these are the notebooks I've been using lately - very satisfactory indeed. I bought these many years ago for course notes, but didn't use all of them, and I just unearthed the last two. I've been very impressed.
The paper is 90gsm and each of these particular books has 90 sheets - at 3p per sheet, it's a big saving on my local Clairefontaine outlets.
Edit: For some examples, check out the ink reviews I just did of Waterman's Havana and Parker Penman Sapphire.