I had been buying Pergamenata from Cornelissen's. They sell a set weight at £1.95 per 70x50 cm sheet. Now, I'd gone to Shepherd's/Falkiner's on my last trip to London, and they sell 70x100cm sheets.
So, when I ran out of stuff, I ordered online from S/F. I ordered online the midweight (160), which was £4-odd per sheet.
When it came (swiftly, and without hassle, to their credit), I was rather shocked to find it was very flimsy. It seems that Cornelissen sell the 230 pergamenata ( or some weight heavier than 160) as standard. Even accounting for the fact it's half the size, it would appear to be much cheaper to buy from Cornelissen's (£1.95 for 70x50 as opposed to over £6 for 70x100--even buying two sheets is cheaper).
Have the hive mind found anywhere that sells the larger sheets for around £4 per sheet (which would be the price of buying 2 sheets from Cornelissen's)? Also, has anyone ordered from Cornelissen's online, as their search engine doesn't yield any results for "pergamenata"? Or should I just ring them and order over the phone?