Will this Java moss grow?

Growing Java moss

I think if you look you'll find lots of info in this forum on j moss. From what I've gleaned it is slow to grow but the more you have the faster it grows kind of like exponential growth. I'd suggest asking (WTB) under classifieds and you might get a decent amount to work with pretty cheaply.
My experience is the stuff is super hardy (I've frozen it) and grows best if kept free of detritus. Hope this helps

Oh you're in England

Sorry just noticed this maybe aquabid and using one of those guys from Thailand might be not too bad way to go

lots of people here sell java moss. So i would get from them before aquabid. Also yes it grows really really slow but that's not a bad thing because that means you'll have little to no maintenance required.