Sufix Advance G2 Low-Vis Green 300m, Diameter: 0.20mm, Breaking Strain: 9.9lb . £10.79 . Angling Direct. Diameter is the same for twice the breaking strain.
Despite Hungary being mentioned, the label clearly shows it as being Japanese technology. One wonders though why in over 50 years this is the first time No 1 grade line is being mentioned? That said, it may well be worth a try.